Allen-Bradley 700-TBR24 — SPDT 6A Relay Buying Guide

By Abdullah Zahid
16 min read
Allen-Bradley 700-TBR24 SPDT 6A 24V AC/DC terminal block replacement relay insert for 700-H 700-HL bases

Allen-Bradley 700-TBR24 — 700-H General Purpose Replacement Relay, SPDT (1 C/O), 6 A, 24 V AC/DC Coil, Terminal Block Style

Controls engineers and maintenance teams searching for the Allen-Bradley 700-TBR24 are typically at one of two points: replacing a failed relay insert in an existing 700-H/700-HL terminal block assembly, or specifying a standard interposing relay for a new Rockwell-based panel. Either way, the decision hinges on three hard facts — coil voltage is 24 V AC/DC, contact form is SPDT (1 C/O), and the contact current rating is 6 A. Get those three right and the 700-TBR24 drops straight into a matched 700-H/700-HL base with no rewiring and no rework.

If you have already confirmed this is the correct part, check current pricing and availability for the Allen-Bradley 700-TBR24 at LeadTime.ca — we ship worldwide.

Who Should Buy the Allen-Bradley 700-TBR24 — and Who Shouldn't

The 700-TBR24 is the right choice if your application meets all of the following criteria:

  • Your control supply is 24 V AC or 24 V DC and must match this exact coil voltage rating.
  • Your existing relay base is part of the Allen-Bradley Bulletin 700-H or 700-HL terminal block relay family and is rated to accept 700-TBR series inserts.
  • A single-pole SPDT (1 C/O) contact arrangement at 6 A is adequate for the connected load — both in steady-state current and inrush.
  • Standard silver-alloy contacts are acceptable for your signal levels; your specification does not require gold-plated contacts.
  • Your plant or panel design is standardized on Allen-Bradley components within a Rockwell Automation ecosystem.

If your control voltage is 12 V, 48 V, or 110/125 V AC/DC, you need a different catalog number — 700-TBR12, 700-TBR48, or the appropriate higher-voltage variant. If your signal levels are low enough to require gold-plated contacts, choose the 700-TBR24X instead. If your load requires multiple poles or a current rating beyond 6 A, a different relay family is the correct path.

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What the Allen-Bradley 700-TBR24 Actually Does in a Control Panel

The 700-TBR24 is a relay insert — not a complete relay assembly. That distinction matters at the ordering stage. The relay body plugs into a matched Allen-Bradley Bulletin 700-H or 700-HL terminal block base, which provides all external wiring terminations. The relay itself carries the coil and contact mechanism; the base provides the terminal connections, mechanical retention, and optional LED status indication depending on the base model selected. If you are ordering for a new installation and have no compatible base already installed, you need both components.

In operation, the 700-TBR24 functions as a general-purpose interposing or isolation relay. A low-level control signal — typically a PLC digital output operating at 24 V DC or 24 V AC — energizes the coil, which mechanically switches the SPDT contact set. The common (C) terminal connects to either the normally open (NO) or normally closed (NC) contact depending on coil state, allowing the relay to switch a separate higher-voltage or higher-current load circuit that the PLC output cannot drive directly. The 6 A contact rating covers a wide range of typical industrial field loads including solenoid valves, small contactor coils, pilot lamps, and motor starter control circuits at common AC and DC panel voltages.

The 24 V AC/DC coil is a practical advantage in mixed-voltage panels where control power may be sourced from either an AC transformer secondary or a DC power supply. One relay variant covers both without substitution.

Typical System Architecture and Signal Chain Position

The 700-TBR24 sits between the controller output card and the field load in the signal chain, acting as the electrical barrier and switching element that protects the PLC output from the load circuit.

  • PLC or controller digital output card (24 V DC typically) — sources the coil control signal.
  • 700-H or 700-HL terminal block base — mounted on DIN rail in the control panel, provides all field wiring connections.
  • 700-TBR24 relay insert — plugged into the base; coil energized by the PLC output, contact switches the load circuit.
  • Field load circuit — solenoid coil, pilot lamp, contactor coil, or small motor circuit connected to the contact terminals on the base.
  • External overcurrent protection — fusing or circuit protection device on the load side, sized to protect the contact at or below 6 A per panel design.

Where the 700-TBR24 Gets Used: Industries and Applications

In factory automation and discrete manufacturing, the 700-TBR24 is a standard interposing relay for PLC digital outputs that need to switch field devices at voltages or currents above what the output card can handle natively. Automotive assembly lines, conveyor systems, and material handling equipment routinely use terminal block relay assemblies in this role, with the 700-TBR24 as the replaceable element inside each 700-HL base.

Food and beverage packaging lines use the 700-TBR24 in I/O marshalling panels where signals from remote field devices are consolidated and distributed to the PLC. The terminal block format supports dense panel layouts with clean wiring, and the plug-in relay insert makes on-line maintenance fast when a relay needs replacement during a production shutdown.

OEM machine builders standardized on Rockwell Automation hardware specify the 700-TBR24 as a plant-standard component, which simplifies spares management at end-user facilities already running Allen-Bradley equipment. Water and wastewater facilities and process skids with Rockwell control hardware use the same relay for isolation between control and field circuits on pumps, valves, and indicator panels.

Application Typical Deployment
PLC digital output isolation 700-TBR24 inserts in 700-HL bases on DIN rail adjacent to PLC I/O rack, switching 24 V or 120 V AC field loads
I/O marshalling panel Multiple 700-TBR24 relays in terminal block rows distributing control signals to solenoids and actuators
MRO relay replacement Direct plug-in swap of failed relay insert in existing 700-HL base during scheduled or emergency maintenance
OEM machine panel standardization Specified as plant-standard interposing relay in new panel builds for Rockwell-based control systems
Retrofit and panel upgrades Installed in replacement terminal block bases during panel modernization projects on Rockwell-standard plants

Key Specifications for the Allen-Bradley 700-TBR24

Specification Value
Brand Allen-Bradley (Rockwell Automation)
Catalog Number 700-TBR24
Product Family Bulletin 700-H / 700-HL Terminal Block Relays
Relay Type General purpose plug-in replacement relay, terminal block style
Contact Configuration SPDT (1 C/O)
Contact Current Rating 6 A
Coil Voltage 24 V AC/DC
Coil Type Universal AC/DC coil (50/60 Hz for AC operation)
Mounting / Interface Plug-in relay insert for 700-H / 700-HL terminal block base
Standards / Approvals International and regional industrial standards including UL and CSA listings as documented by manufacturer

Full technical specifications are available on the product page at LeadTime.ca.

700-TBR24 vs Other Coil Voltage Variants — Which One Do You Need?

The 700-TBR series uses the coil voltage as the differentiating suffix. Contact configuration (SPDT, 1 C/O) and contact current rating (6 A) remain consistent across the standard voltage variants. The only variable that changes with the catalog number is the coil operating voltage. Choosing the wrong variant means a relay that either will not operate reliably or will be overstressed by the control supply.

Model Coil Voltage Contact Configuration Contact Rating Contact Material Base Compatibility
700-TBR24 24 V AC/DC SPDT (1 C/O) 6 A Standard 700-H / 700-HL terminal block base
700-TBR24X 24 V AC/DC SPDT (1 C/O) 6 A Gold-plated 700-H / 700-HL terminal block base
700-TBR12 12 V AC/DC SPDT (1 C/O) 6 A Standard 700-H / 700-HL terminal block base
700-TBR48 48 V AC/DC SPDT (1 C/O) 6 A Standard 700-H / 700-HL terminal block base

If your control circuit operates at 48 V, the 700-TBR48 is the correct insert — a 700-TBR24 will not operate correctly at that voltage. Conversely, applying a 24 V coil to a 48 V supply risks coil damage. Verify your control supply voltage against the catalog number suffix before placing any order. Check availability and confirm the right variant at LeadTime.ca.

Standard vs Gold-Plated Contacts: 700-TBR24 vs 700-TBR24X

The 700-TBR24X shares every specification with the 700-TBR24 — 24 V AC/DC coil, SPDT 1 C/O contact form, 6 A rating, and full compatibility with the 700-H/700-HL base family — with one difference: gold-plated contacts. That difference matters when the relay is switching low-level signals where silver contacts may develop surface oxides that create unacceptably high contact resistance at low current levels.

Standard silver-alloy contacts on the 700-TBR24 perform reliably when switching loads at normal control voltages and moderate currents — solenoids, pilot lamps, contactor coils. At very low signal currents, silver contact surfaces can form an oxide film that standard contact wiping action may not reliably break through. Gold-plated contacts maintain a low and stable contact resistance across a wider range of switched currents, which is why the 700-TBR24X is the preferred choice wherever low-level analog or digital signals are being switched, or where high reliability in a corrosive atmosphere is a specification requirement.

If your panel specification or OEM standard calls for gold contacts, order the 700-TBR24X — do not substitute the 700-TBR24 and expect equivalent performance at low signal levels. If your application switches normal industrial loads at standard voltages and currents at or below 6 A, the 700-TBR24 is appropriate and the gold contact variant adds cost without a practical benefit.

Expert Verdict: Is the Allen-Bradley 700-TBR24 the Right Relay for Your Panel?

The 700-TBR24 earns its place in any panel that already uses Allen-Bradley 700-H or 700-HL terminal block relay bases with 24 V control. It is a 6 A SPDT relay insert that drops directly into the existing base without any rewiring, which means maintenance replacements take minutes rather than hours. The 24 V AC/DC coil covers the most common control voltage in modern industrial panels, and the manufacturer-documented compatibility with the 700-H/700-HL family removes the guesswork from replacement decisions. For controls engineers maintaining Rockwell-standard facilities, panel builders designing to Allen-Bradley specifications, and maintenance teams who need a confirmed like-for-like swap during a shutdown window, this is a low-risk, well-supported choice backed by manufacturer documentation and broad North American distributor availability.

The limitations are real and worth stating plainly. The 700-TBR24 is a single-pole relay — if your application needs two or more poles switched simultaneously, you need a different relay family. At 6 A, it covers the majority of interposing relay applications, but it is not the right device for switching heavy motor loads or circuits with high inrush current that approaches or exceeds that rating after derating for load type. It is also not a safety relay — do not use the 700-TBR24 in safety functions that require certified safety-rated components. For low-level signal applications, choose the 700-TBR24X with gold-plated contacts rather than the standard variant. If there is no Rockwell standardization requirement on the project and cost is the primary driver, generic relay alternatives at comparable ratings are available — but they will not be mechanically compatible with an installed 700-HL base.

From a procurement standpoint, the 700-TBR24 is widely stocked at major North American distributors and is an active catalog product with confirmed manufacturer support. That availability profile means maintenance teams can reliably keep a small stock on the shelf and replenish quickly without long lead time exposure. A specialist automation distributor adds value here beyond just supplying the part — confirming that your installed base is a compatible 700-H/700-HL assembly, advising on whether standard or gold contacts are the right call for your signal levels, and providing accurate real-time stock and delivery information before you commit to a build schedule. See current pricing and stock status for the 700-TBR24 at LeadTime.ca — we ship worldwide.

For volume pricing, build schedules, or to confirm lead time before committing to a project, contact the LeadTime.ca team directly — we ship worldwide.

What Engineers Need to Know Before Ordering the Allen-Bradley 700-TBR24

Community discussion specifically targeting the 700-TBR24 catalog number is limited — most forum threads dealing with Allen-Bradley terminal block relays address the 700-H and 700-HL family broadly rather than individual insert variants. What that community feedback consistently reflects is that the 700-H/700-HL relay family is regarded as reliable and straightforward to service, with praise directed at how cleanly the plug-in insert format supports field replacements compared with older panel relay designs. The 24 V AC/DC coil variants draw particular appreciation from engineers working in mixed-voltage panels where both AC and DC control power sources are present, eliminating the need to stock separate relay variants for each supply type.

The complaints that appear consistently in community threads are not about relay performance — they are about ordering errors. Users note a recurring pattern of confusion between the relay insert (the 700-TBRxx part number) and a complete 700-HL relay assembly that includes both the base and the relay. Ordering only the insert when the base is also damaged or missing is a common source of delays. A second frequent ordering mistake is selecting the wrong coil voltage suffix — a panel running 120 V AC coils does not need a 700-TBR24, and the similar-looking catalog numbers across the 700-TBRxx series make it easy to grab the wrong variant under time pressure. A third documented community error is ordering standard contacts when the existing installed relay or the panel specification called for gold-plated contacts (700-TBR24X), which requires a second order and another delay.

Because model-specific community data for the 700-TBR24 is sparse, the most reliable source of pre-order guidance is a specialist distributor who can cross-reference your installed base against the 700-TBR catalog, confirm whether your hardware is a compatible 700-H/700-HL assembly, and advise on contact material requirements before the order is placed. That conversation takes a few minutes and eliminates the most common sources of wrong-part returns and unplanned downtime. LeadTime.ca carries the 700-TBR24 and the team is available to confirm compatibility before you commit.

Replacement and Wiring Overview for the Allen-Bradley 700-TBR24

  • The 700-TBR24 is a plug-in relay insert — all field wiring connections are made at the 700-H/700-HL terminal block base, not at the relay body itself. No rewiring of the base is required when replacing the relay insert.
  • Before removing or installing the relay insert, isolate control power to the circuit and verify absence of voltage at the base terminals following your facility lockout/tagout procedure.
  • The relay insert is orientation-keyed to the base. Align the relay body with the base housing before pressing to seat — forcing the insert at an incorrect angle can damage the base pins.
  • The SPDT contact set provides Common (C), Normally Open (NO), and Normally Closed (NC) terminals at the base. Confirm the load circuit is wired to the correct terminal for the intended energized or de-energized state before re-energizing.
  • The 700-TBR24 has no integrated overcurrent protection. External fusing or circuit protection on the load side must be sized appropriately for the application and must not exceed the 6 A contact rating; derate contacts for inductive loads per the manufacturer datasheet.

Commissioning Checks After Replacing a 700-TBR24 Relay Insert

  • After inserting the new relay into the base, visually confirm the relay body is fully seated and flush with the base housing — a partially seated relay will not make reliable coil or contact connections.
  • Inspect the base terminal block for signs of overheating, discoloration, or pin damage before re-energizing; a damaged base requires replacement before the new relay insert is put into service.
  • With the circuit re-energized, apply the 24 V AC or DC control signal to the coil terminals and verify the controlled load responds correctly — use a multimeter across the NO and NC contacts to confirm switching if the load is not immediately visible.
  • De-energize the coil and confirm the relay returns cleanly to its de-energized state; repeated energize/de-energize cycles under no-load conditions can confirm contact and coil integrity before returning the machine to production.
  • After a short period of normal operation under load, verify there is no abnormal heating at the relay or base and no audible chatter, which would indicate a coil voltage problem or an overloaded contact.

Wrong-Part Prevention Checklist for the Allen-Bradley 700-TBR24

Before placing your order, work through this checklist. Each item addresses a documented ordering error that results in incompatible parts, delayed maintenance, or in-service failures.

  1. Verify the installed relay base/terminal block is part of the 700-H/700-HL family and is rated for 700-TBR relays.
  2. Confirm control supply is 24 V AC or DC and matches the 24 V AC/DC coil requirement of 700-TBR24.
  3. Check that a single-pole SPDT (1 C/O) contact arrangement and 6 A rating are adequate for the load type and inrush current.
  4. Confirm whether standard contacts are acceptable or if gold-plated (700-TBR24X) contacts are required by specification.
  5. Match electrical ratings (voltage, current, utilization category) to the application per the datasheet and panel standards.
  6. Ensure the relay's environmental specs (temperature, pollution degree) match the panel and operating environment.

If any of these checks raises a question before you order, contact the LeadTime.ca team for pre-order compatibility confirmation — it is faster than returning a wrong part.

Frequently Asked Questions

Is the 700-TBR24 relay insert compatible with any Allen-Bradley 700-HL base I already have installed?

The 700-TBR24 is specified by the manufacturer as a replacement relay for Bulletin 700-H and 700-HL terminal block relay assemblies. Compatibility is with that specific base family. If your installed base is from a different Allen-Bradley relay bulletin or a third-party terminal block system, the 700-TBR24 insert will not be mechanically or electrically compatible. Always verify the base catalog number against the 700-H/700-HL family before ordering the insert.

Can the 700-TBR24 coil operate on both 24 V AC and 24 V DC, or is it limited to one?

The 700-TBR24 is specified with a universal 24 V AC/DC coil, which means it will operate on either a 24 V AC control supply (at 50 or 60 Hz) or a 24 V DC control supply. This is one of the practical advantages of this variant in mixed-voltage panels. Do not apply voltages significantly above the rated 24 V nominal, as this can overstress the coil and shorten relay life.

What loads can the 6 A contact safely switch, and does the rating apply to both AC and DC loads?

The 6 A contact current rating is the general-purpose rating documented by the manufacturer. Actual switching capacity varies by load type — resistive loads at rated voltage can typically use the full rating, while inductive loads such as solenoid coils and contactor coils require derating due to higher inrush and arc energy. AC and DC switching impose different contact stresses; refer to the manufacturer's utilization category tables in the datasheet for your specific load type and voltage before finalizing the application.

When should I choose the 700-TBR24X instead of the standard 700-TBR24?

Choose the 700-TBR24X whenever your application involves switching low-level signals where contact resistance must remain stable at low current levels, or where your panel specification explicitly requires gold-plated contacts. Gold plating prevents the surface oxide formation on silver contacts that can cause unreliable switching at low signal levels. If you are switching normal industrial loads — solenoids, lamps, contactor coils — at standard panel voltages and currents within the 6 A rating, standard 700-TBR24 contacts are appropriate.

How do I quickly confirm whether a 700-TBR24 relay insert has failed and needs replacement?

With the circuit de-energized and the relay removed from the base, use a multimeter in continuity mode across the coil terminals to check for an open or shorted coil — a healthy coil will show a finite resistance consistent with the coil specification, not an open circuit or a short. With the coil energized at rated voltage, use a multimeter across the Common and Normally Open terminals to confirm the contact closes to continuity; de-energize and confirm the Common-to-Normally Closed path closes. Welded contacts will not open when the coil is de-energized, and an open coil will show no switching action when voltage is applied.

Is the 700-TBR24 an active product, or should I be concerned about long-term availability?

The 700-TBR24 is documented as an active product within the Allen-Bradley Bulletin 700-H family. It is widely stocked at major North American distributors and is a standard MRO part for plants running Rockwell-based control systems. Stock levels can fluctuate with demand, so facilities that rely on this relay for critical machine maintenance should carry a small on-hand spare inventory rather than depending entirely on same-day distributor availability. Current stock status is available on the 700-TBR24 product page at LeadTime.ca.

Why Order the Allen-Bradley 700-TBR24 from LeadTime.ca

  • LeadTime.ca ships Allen-Bradley 700-TBR24 relays worldwide — not limited to Canada or North America.
  • Specialist automation distributor with the technical context to confirm 700-H/700-HL base compatibility and advise on standard vs gold-contact variants before you order.
  • Real-time stock and lead time information available on the product page — no estimate requests required for basic availability checks.
  • Volume pricing available for OEM build quantities and MRO stocking programs — contact the team for current volume pricing.
  • Hard-to-source and end-of-availability industrial parts sourced globally — if the standard channel is showing long lead times, LeadTime.ca has sourcing options.

Allen-Bradley 700-TBR24 — At-a-Glance Summary

  • Catalog number: 700-TBR24 — replacement relay insert for Allen-Bradley Bulletin 700-H / 700-HL terminal block relay assemblies.
  • Coil voltage: 24 V AC/DC universal coil, covering 50/60 Hz AC and DC control supplies at 24 V nominal.
  • Contact configuration: SPDT (1 C/O) — one Common, one Normally Open, one Normally Close contact path.
  • Contact current rating: 6 A general purpose; derate for inductive loads per manufacturer datasheet utilization category tables.
  • This is the relay insert only — a compatible 700-H or 700-HL terminal block base must already be installed or ordered separately.
  • Gold-plated contact variant: 700-TBR24X — same coil voltage and contact form, required for low-level signal applications.
  • Other coil voltage variants: 700-TBR12 (12 V), 700-TBR48 (48 V) — verify your control supply before selecting a catalog number.
  • Standards: UL and CSA listings plus additional international industrial standards as documented by Allen-Bradley (Rockwell Automation).
  • Active product with broad North American distributor availability; maintain on-hand spares for maintenance-critical installations.
  • Pricing available on the product page at LeadTime.ca; ships worldwide.

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