Allen-Bradley 800T-XA Contact Block — Specs, Depth & Fit Guide

By Abdullah Zahid
15 min read
Allen-Bradley 800T-XA shallow 30 mm contact block 1NO 1NC for Bulletin 800T 800H push button operators

Allen-Bradley 800T-XA Shallow 30 mm Contact Block, 1 NO / 1 NC — Specs, Wiring, and Buying Guide

If you are specifying or replacing a contact block in a Bulletin 800T or 800H push button station, the Allen-Bradley 800T-XA is the shallow-profile, 1 NO / 1 NC option that solves the enclosure depth problem without sacrificing the A600-rated, 600 V AC contact performance your control circuit demands. Whether you are an MRO buyer chasing a like-for-like replacement, a panel builder laying out a new start/stop station, or a controls engineer validating a BOM for a harsh-environment machine, the single most important step before ordering is confirming your operator family, contact configuration, and available enclosure depth — all three, not just one.

If you have already confirmed this is the right part, check current pricing and availability for the Allen-Bradley 800T-XA at LeadTime.ca — ships worldwide.

Who Should Buy the Allen-Bradley 800T-XA — and Who Shouldn't

The 800T-XA is the right contact block when all of the following are true for your application:

  • Your panel uses Bulletin 800T or 800H 30 mm heavy-duty push button operators — this block does not mount on 22 mm families such as 800F.
  • Your control circuit logic requires exactly one normally open and one normally closed contact from a single block.
  • Enclosure depth is limited and a shallow contact block is required to clear panel doors, wireway, or adjacent components.
  • The controlled circuit operates at or below 600 V AC with a continuous current at or below 10 A (Ith), consistent with the A600 control rating.
  • Your installation must comply with UL, CSA, or equivalent approvals as part of an operator assembly achieving NEMA Type 4 or Type 13 protection.

If your application needs two NO contacts, two NC contacts, or more poles than a single 1 NO / 1 NC block provides — or if you are designing a new high-density panel where 22 mm IEC-style hardware would reduce cost and footprint — you should review alternative Bulletin 800T blocks or the 800F 22 mm family before ordering the 800T-XA.

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What the Allen-Bradley 800T-XA Actually Does in a Control Panel

The Allen-Bradley 800T-XA is a 30 mm shallow contact block providing one normally open and one normally closed contact. It is a purely passive switching element — it mounts to the rear of a Bulletin 800T or 800H heavy-duty push button operator and changes the state of those contacts when the operator is actuated. It does not provide illumination, circuit protection, or any logic function on its own.

The practical role is straightforward: when a machine operator presses a 30 mm push button fitted with an 800T-XA block, the NC contact opens and the NO contact closes simultaneously. This changeover action is the foundation of start/stop logic, interlock circuits, and status feedback in PLC I/O systems. The A600 contact rating and 600 V AC maximum make it appropriate for control-level circuits — it is not a power feeder switch and must not be used to switch motor loads directly.

The shallow profile is what separates the 800T-XA from standard-depth 800T contact blocks. In crowded panels where wireway, terminal blocks, or panel doors limit the space behind the operator, a shallow block is not a convenience — it is a dimensional requirement. Ordering a standard-depth block in that situation means the panel door will not close, so this detail carries real installation consequences.

Where the 800T-XA Sits in a Typical Bulletin 800T System

The 800T-XA occupies the contact block position at the rear of the operator assembly — the point where mechanical actuation is converted into electrical switching for the control system. Understanding the component chain helps prevent compatibility errors at the ordering stage.

  • Panel enclosure or operator station — provides the NEMA Type 4 or Type 13 environmental rating for the complete assembly; the contact block alone does not carry this rating.
  • Bulletin 800T or 800H 30 mm operator — the front-of-panel push button, selector switch, or pilot light that accepts the mechanical input and transfers it to the contact block.
  • Allen-Bradley 800T-XA contact block — mounts to the rear of the operator via screw-type mechanical attachment; contains the 1 NO / 1 NC contacts rated to 600 V AC, A600.
  • Control wiring from the 800T-XA terminals — carries the switched signal to the PLC digital input card, safety relay, contactor coil, or other control device downstream.
  • External protection devices — fusing, overloads, or safety relays as required by the control design; these are separate from the 800T-XA and must be specified independently.

Typical Applications for the 800T-XA Contact Block

Start and stop stations are the most common application. A 30 mm 800T or 800H operator paired with an 800T-XA provides the NO contact for a start signal and the NC contact for a stop or interlock signal from a single push button, simplifying panel wiring and reducing the number of blocks required per station.

In motor control centers and local control stations for conveyors, pumps, and fans in automotive, metal processing, and pulp and paper environments, the 800T/800H family has a long installed base. Maintenance teams at these facilities frequently need the 800T-XA as a like-for-like replacement when contact blocks wear or fail, and the shallow variant is often the original specification in panels with limited rear depth.

Water and wastewater utilities and food and beverage plants using 30 mm NEMA 4/13 operator assemblies in washdown or oil-tight environments also rely on 800T hardware. In these installations, the 800T-XA contact block is part of an assembly whose front-of-panel sealing and enclosure define the environmental rating — a point that becomes important during safety and inspection audits.

MRO and spare parts stocking is a significant use case in its own right. Plants standardized on Bulletin 800T/800H hardware often stock 800T-XA blocks as critical spares to support rapid maintenance response without waiting for distributor deliveries during unplanned downtime.

Application Typical Deployment
Start/stop control stations 800T or 800H push button operator with 800T-XA providing 1 NO (start) and 1 NC (stop) contacts in a single block
Local motor control — harsh environment 30 mm NEMA 4/13 operator assembly on conveyors, pumps, or fans in automotive and heavy process facilities
Interlock and status feedback circuits NC contact used for interlock; NO contact feeds PLC digital input for run/stop status confirmation
Washdown and oil-tight panels 800T-XA installed in complete operator assemblies rated for food and beverage or water/wastewater environments
Legacy panel retrofit and MRO replacement Like-for-like swap in existing Bulletin 800T/800H installations where original contact blocks have worn or failed

Specifications and Variant Comparison for the 800T-XA

Parameter Value Notes
Brand / Manufacturer Allen-Bradley (Rockwell Automation) Official Bulletin 800T/800H accessory
Catalog Number 800T-XA Verify suffixes if ordering special variants
Product Type 30 mm shallow contact block For Bulletin 800T and 800H operators only
Contact Configuration 1 normally open, 1 normally closed (changeover) Confirm logic requirements before ordering
Maximum Voltage 600 V AC Control-duty circuits only; not a power feeder switch
Contact Rating A600 Industrial control circuit rating
Thermal Continuous Current (Ith) 10 A AC Verify DC rating in Rockwell datasheet
Depth Profile Shallow For limited rear-of-panel clearance applications
Terminal Type Screw-type Use wire sizes and torque per Rockwell datasheet
Standards / Approvals UL, CSA, and other listed standards (CE, CCC) NEMA 4/13 rating applies to complete assembly, not block alone

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

800T-XA vs. Other Bulletin 800T Contact Block Options

Model / Variant Contact Configuration Depth Profile Best For
800T-XA 1 NO + 1 NC Shallow Shallow enclosures needing changeover contacts on 800T/800H operators
Other 800T blocks (2 NO variants) 2 NO Standard or shallow Applications requiring two normally open contacts
Other 800T blocks (2 NC variants) 2 NC Standard or shallow Applications requiring two normally closed contacts
Standard-depth 800T blocks Various Standard Panels with adequate rear clearance where depth is not constrained
Allen-Bradley 800F (22 mm family) Various 22 mm form factor New high-density panel designs where 22 mm IEC-style hardware is preferred — not mechanically compatible with 800T operators

If your operator is already installed and your enclosure is shallow, the 800T-XA is the direct answer — check current availability at LeadTime.ca. If you need a different contact combination or are designing for a new panel without depth constraints, reviewing the full Bulletin 800T contact block range will help you land on the right catalog number before ordering.

Expert Verdict: Is the Allen-Bradley 800T-XA the Right Contact Block for Your Panel?

The 800T-XA earns its place in the toolkit of any plant or OEM that is committed to the Bulletin 800T and 800H ecosystem. Its shallow profile is not a compromise — it is a deliberate design that solves a real problem in panels where standard-depth blocks simply will not fit. The 1 NO / 1 NC changeover configuration covers the majority of start/stop and interlock requirements in a single block, and the A600 rating at up to 600 V AC with a 10 A continuous current (Ith) puts it well within the demands of industrial control circuits. For MRO teams replacing failed blocks in legacy 800T panels, or for panel builders laying out NEMA 4/13-rated operator stations in automotive, mining, or heavy process environments, this is the part to specify. Its UL and CSA approvals support use in regulated facilities without the re-evaluation overhead that comes with substituting a non-listed device.

Where the 800T-XA is not the right answer is equally clear. If you are starting from a blank panel design and prioritizing component density and lower hardware cost, the 22 mm Allen-Bradley 800F family offers a different form factor that can reduce both panel footprint and per-point expense — though it is not mechanically compatible with 800T or 800H operators, so it is a system-level decision, not a drop-in swap. If your logic requires two NO contacts or two NC contacts, a different Bulletin 800T block with the correct configuration is what you need; installing an 800T-XA and rewiring around the wrong contact arrangement is a troubleshooting problem waiting to happen. And if your enclosure has adequate rear depth and cost is a consideration, a standard-depth 800T block may source more easily or at a slightly better price point.

From a procurement standpoint, the 800T-XA is commonly stocked at major distributors given the breadth of the 800T/800H installed base worldwide, but availability can tighten during supply constraints or when large project orders absorb inventory. A specialist distributor can validate your BOM against the correct catalog number, check current Rockwell lead times, and identify whether an alternative 800T block or a different depth variant is available faster if the 800T-XA is on extended lead time. That kind of pre-order compatibility check is where distributor expertise pays for itself — errors in operator family, contact configuration, or depth cost more in rework and downtime than they ever save in sourcing shortcuts. View current pricing and lead time for the Allen-Bradley 800T-XA at LeadTime.ca.

For volume pricing, project BOM validation, or to confirm stock before committing to a build schedule, contact the LeadTime.ca team directly — we ship worldwide.

What Engineers Get Wrong When Ordering the Allen-Bradley 800T-XA

Because the 800T-XA has limited model-specific forum discussion separate from the broader Bulletin 800T/800H family, the most useful guidance here comes from patterns observed across the 800T line in engineering communities including PLCTalk, r/PLC, r/industrialautomation, and distributor Q&A sections — all of which surface the same recurring ordering errors.

The single most reported mistake is assuming that any Allen-Bradley contact block will fit any Allen-Bradley push button. The 800T-XA is designed exclusively for 30 mm Bulletin 800T and 800H operators. Technicians who encounter a failed contact block in a panel and order a replacement without checking the operator family first sometimes discover on arrival that the block will not mount — because the panel was later fitted with 22 mm 800F operators, or because the drawing listed the catalog number without the operator family context. The fix is simple: confirm the operator legend ring or documentation shows Bulletin 800T or 800H and a 30 mm cutout before placing the order.

The second recurring pattern is contact configuration confusion. Bulletin 800T blocks are available in multiple contact arrangements — 1 NO / 1 NC, 2 NO, 2 NC, and stackable combinations — and the 800T-XA is specifically the 1 NO / 1 NC shallow variant. Community members report ordering the wrong combination when BOMs are incomplete or when a technician replaces a block based on visual similarity rather than catalog number verification. Separately, there are reports of technicians attempting to change a push button from momentary to maintained behavior by swapping contact blocks rather than changing the operator itself — the 800T-XA contact block does not control latching behavior; that is an operator-level function. Checking the control schematic against the required contact logic before ordering eliminates both of these errors.

On the cost side, community sentiment across the 800T line is consistent: buyers acknowledge that 30 mm heavy-duty hardware carries a price premium over 22 mm IEC-style alternatives. The consensus, particularly among maintenance electricians in harsh-environment facilities, is that the reliability and longevity of the 800T family justifies the cost in critical applications — but for new panel designs without existing 800T infrastructure, the cost difference relative to 22 mm alternatives is a legitimate factor to evaluate at the design stage rather than after standardization decisions are made.

Wiring and Installation Overview for the Allen-Bradley 800T-XA

  • The 800T-XA mounts to the rear of a Bulletin 800T or 800H 30 mm operator; ensure the block is fully seated and correctly oriented so that the NO and NC terminals correspond to the schematic design intent before terminating any wires.
  • Identify terminal markings for the NO and NC contacts before connecting control wiring; reversing these connections is a common source of inverted logic that can be difficult to trace after panel closure.
  • Use control-voltage wiring only; wire sizes and terminal torque values are specified in the Rockwell datasheet and must be followed to maintain contact integrity and UL/CSA listing compliance.
  • After termination, verify correct NO and NC operation using a multimeter in continuity mode with the control circuit de-energized before restoring power — this catches mechanical misalignment and wiring errors before they reach the PLC or control system.
  • In multi-block stacking configurations on a single operator, confirm that the complete assembly fits within the available enclosure depth; the shallow profile of the 800T-XA addresses single-block depth, but stacked assemblies require independent depth verification.

Wrong-Part Prevention: How to Order the 800T-XA Without Errors

Before placing your order for the Allen-Bradley 800T-XA, work through each item on this checklist. These are the exact checks that prevent the most common and costly ordering errors with this part:

  1. Confirm panel cutout is 30 mm and operator family is Bulletin 800T or 800H; do not use 800T-XA with 22 mm operators.
  2. Verify the machine or panel design truly needs 1NO + 1NC; if two NO or two NC contacts are required, choose the correct alternative block.
  3. Check enclosure depth and wiring space; if depth is not constrained, a standard-depth contact block may be acceptable (and sometimes lower cost).
  4. Confirm voltage and current of the controlled circuit do not exceed the A600/600 V AC and continuous current ratings.
  5. Ensure environmental requirements (washdown, oil-tight, dust-tight) are met by the complete operator assembly (proper 800T/800H operator and enclosure) and not assumed from the contact block alone.
  6. Verify terminal type (screw-clamp) and acceptable wire size range match plant standards and existing wiring practices.

If any item on this checklist raises a question about compatibility or configuration, contact the LeadTime.ca team before ordering — confirming the right part before shipment is always faster than processing a return and waiting for the correct block to arrive.

Frequently Asked Questions About the Allen-Bradley 800T-XA

Can I use the 800T-XA on any Allen-Bradley push button, or is it restricted to specific operator families?

The 800T-XA is designed specifically for Bulletin 800T and Bulletin 800H 30 mm heavy-duty push button operators. It is not compatible with 22 mm families such as the 800F, and it will not mechanically mount to operators outside the 800T/800H line. Always confirm the operator catalog number and cutout size — 30 mm — before ordering this block.

What does the A600 contact rating on the 800T-XA mean for my control circuit design?

The A600 designation is a NEMA contact rating indicating suitability for AC control-duty switching at up to 600 V AC. It defines the make, carry, and break capacity of the contacts for inductive and resistive control loads. The 800T-XA is not rated for direct power switching of motor feeders or high-current loads — keep it in control-level circuits where voltage and current remain within the A600 and 10 A (Ith) limits.

Is the 800T-XA suitable for safety-related control circuits?

The 800T-XA carries UL and CSA approvals and is used in many industrial control circuits that include safety functions. However, whether it is appropriate for a specific safety circuit depends on the required Safety Integrity Level, the circuit architecture, and the safety relay or safety controller it connects to — none of which are determined by the contact block alone. For safety-rated applications, consult the applicable machinery safety standard and your safety system supplier to confirm that the complete assembly meets the required performance level or SIL.

How do I confirm whether I need the shallow 800T-XA or a standard-depth 800T block for my panel?

Measure the available depth behind the operator mounting location with the panel door closed and wireway, cable bundles, and adjacent components in their installed positions. If that clearance is tight, specify the shallow 800T-XA. If adequate depth is available, a standard-depth block may be equally suitable and in some cases easier to source. When in doubt, the shallow block is the safer choice for new designs, since it will fit in either situation.

How often should 800T contact blocks be replaced in high-cycle push button applications?

Mechanical service life depends on the specific operator and actuation frequency, and Rockwell publishes cycle ratings in the technical data bulletin for the 800T family. In practice, community feedback from maintenance electricians describes the 800T line as long-lived in normal industrial duty, with contact blocks often lasting years before showing signs of wear. For high-cycle applications, periodic inspection of contacts for pitting or resistance increase and re-torquing of terminal screws is recommended as part of a preventive maintenance schedule rather than waiting for a fault to occur.

Can I stack multiple 800T-XA blocks on one operator to get more than 1 NO / 1 NC?

Bulletin 800T operators are designed to accept multiple contact blocks stacked at the rear to increase the number of switched poles. However, stacking adds depth to the assembly, which can offset the advantage of the shallow 800T-XA profile. If you need additional contacts, verify the total stacked depth against your enclosure clearance, and confirm that the operator model supports the number of blocks you intend to stack by consulting the Rockwell Automation product documentation.

Why Order the Allen-Bradley 800T-XA from LeadTime.ca

  • LeadTime.ca ships the Allen-Bradley 800T-XA worldwide — whether your facility is in Canada, the United States, or elsewhere, the same ordering and support process applies.
  • Specialist distributor expertise means compatibility questions about operator family, contact configuration, and depth are answered before the order ships, not after it arrives.
  • Access to current Rockwell Automation lead time information helps you plan maintenance and project schedules accurately, especially when supply conditions are variable.
  • Volume pricing and project BOM support are available for panel builders, OEMs, and plants stocking multiple 800T-XA blocks as critical spares.
  • View the Allen-Bradley 800T-XA product page or contact LeadTime.ca to confirm availability and get a quote.

At-a-Glance Summary: Allen-Bradley 800T-XA

  • 30 mm shallow contact block with 1 normally open and 1 normally closed (changeover) contact — for Bulletin 800T and 800H operators only.
  • Rated to 600 V AC with A600 contact rating and 10 A thermal continuous current (Ith) for AC circuits — control-duty use only.
  • Shallow profile addresses rear-of-panel depth constraints that standard-depth blocks cannot accommodate.
  • UL and CSA approvals; NEMA Type 4 and Type 13 ratings apply to the complete operator assembly, not the contact block in isolation.
  • Screw-type terminals; wire sizing and torque values are specified in the Rockwell Automation datasheet and must be followed for listed compliance.
  • Not compatible with 22 mm operator families (e.g., 800F); not suitable for power feeder switching beyond its A600 and Ith ratings.
  • Commonly stocked at major distributors worldwide; lead times can extend during supply constraints — verify current availability before committing to a build schedule.
  • Primary ordering risks: wrong operator family, wrong contact configuration, and wrong depth — all preventable with the six-point checklist above.

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