Schneider Electric CA3KN22BD — 24VDC Control Relay Buyer Review

By Abdullah Zahid
14 min read
Schneider Electric CA3KN22BD TeSys K 24VDC 2NO-2NC control relay mounted on DIN rail in industrial control panel

Schneider Electric CA3KN22BD TeSys K Control Relay, 2 NO + 2 NC, 690V, 24VDC Standard Coil — Specs, Price, and Alternatives Guide

Controls engineers specifying a 24VDC control relay for solenoid switching, contactor cascade logic, or PLC output interfacing often arrive at the CA3KN22BD after filtering out relays that don't carry UL and CSA dual certification or can't handle inductive loads without contact degradation. The Schneider Electric CA3KN22BD is a 4-pole electromechanical control relay in the TeSys K family — 24VDC coil, 2NO-2NC contact form, 10A continuous rating, 690V maximum operational voltage, and a 45mm DIN rail footprint that fits two units into a standard 90mm panel slot. If you're at the point of confirming stock and pricing, there's no reason to wait.

If you have already confirmed this is the right part, check current pricing and availability at LeadTime.ca — ships worldwide.

Who Should Buy the CA3KN22BD — and Who Shouldn't

The CA3KN22BD is the right relay when your control circuit checks all of the following boxes:

  • Your PLC output or control circuit provides a stable 24VDC coil signal — not 24VAC, not 12VDC, not 110VAC
  • Your total load current does not exceed 10A continuous under free-air thermal conditions
  • Your load circuit voltage is 690V or less
  • You need both normally-open and normally-closed contacts on a single relay — the 2NO-2NC form handles bidirectional logic without a second relay
  • You're mounting to a 35mm DIN rail or screw-mounting to an enclosure panel surface
  • Your project requires IEC, UL, and CSA multi-standard certification on the same component

If your load current exceeds 10A, the CA3KN32 (20A, same 24VDC coil, same 2NO-2NC form) is the correct upgrade. If your coil voltage is 110VAC or 230VAC, you need a different TeSys K catalog number entirely — the BD suffix designates the 24VDC coil specifically.

On this page:

What the CA3KN22BD Actually Does in a Control Circuit

The CA3KN22BD is not a soft starter, not a VFD, and not a PLC module. It is a straightforward electromechanical control relay — when 24VDC is applied to its coil (3W inrush power), an internal armature pulls in and physically switches four contacts simultaneously: two normally-open contacts close, and two normally-closed contacts open. Remove the 24VDC signal and the spring returns everything to its original state. That mechanical simplicity is exactly what makes it reliable in high-cycle industrial environments operating up to 180 cycles per minute.

The 2NO-2NC contact configuration is the practical reason most engineers select this model over a simpler single-form relay. In solenoid valve control, the NO pair energizes the valve when the PLC output fires. In safety interlock logic, the NC pair holds a permissive circuit closed until the relay is energized — at which point the permissive drops out. Both functions run from one relay, one set of screw clamp terminals, and 45mm of DIN rail space. The AC-15/DC-13 load class rating confirms the contact geometry and material are specifically suited for inductive electromagnetic loads — solenoid coils and contactor coils — which generate back-EMF spikes that destroy contacts not engineered for them.

The multi-standard certification coverage — IEC 60947-4-3, UL, CSA, VDE 0660, BS 5424, NF C 63-140, RoHS, and REACH — is a real procurement advantage for integrators building panels that ship to multiple markets. A single relay catalog number satisfies North American (UL/CSA), European (IEC/VDE/NF), and compliance documentation requirements simultaneously. That eliminates re-specification work when a machine design crosses regional boundaries.

Typical System Architecture and Signal Chain

The CA3KN22BD sits between the logic layer and the load layer in a standard control panel — it receives a switching signal from above and delivers switched power to the device below.

  • 24VDC power supply feeds both the PLC and the relay coil circuit
  • PLC digital output card energizes the CA3KN22BD coil terminal (A1/A2) when the output bit is set
  • CA3KN22BD NO contacts close, completing the load circuit to the solenoid valve coil, contactor coil, or pilot device
  • CA3KN22BD NC contacts simultaneously open, dropping a permissive or safety interlock in the same switching event
  • Load devices (solenoid coils, contactor coils, indicator lights, warning horns) are wired to the contact terminals on the relay output side

Where This Relay Gets Used: Industries and Applications

In pneumatic and hydraulic systems, the CA3KN22BD is most commonly found switching directional control valve solenoids. The AC-15/DC-13 load class rating handles the inrush current and back-EMF generated when a solenoid coil energizes and de-energizes, which would rapidly degrade a general-purpose relay not rated for inductive loads.

In motor starter circuits, the relay appears in cascade control logic — a PLC output fires the CA3KN22BD coil, which uses one NO contact pair to energize a larger contactor coil, while the NC pair provides a status signal back to the control system confirming the relay is not already energized before a sequence step proceeds.

The 2NO-2NC contact form makes the CA3KN22BD useful in dual-channel safety monitoring circuits, where one contact pair feeds the safety relay monitoring channel and the other feeds the operational load. Manufacturing automation, food and beverage packaging lines, CNC machine tool control panels, and HVAC building automation systems are all typical deployment environments where this relay's compact 45mm width and -25 to +50 degrees Celsius operating range are relevant constraints.

Application Typical Deployment
Pneumatic valve solenoid switching PLC digital output drives CA3KN22BD coil; NO contacts energize directional valve solenoid
Motor starter cascade control Relay coil triggered by PLC output; NO contact energizes downstream contactor coil in motor circuit
Safety interlock logic NC contacts hold permissive circuit closed at rest; relay energization breaks permissive on fault condition
PLC output interfacing to plant equipment Relay isolates PLC digital output from higher-current field devices — indicator lights, audible alarms, horns
CNC machine tool control panels Control relay manages startup sequences and holds momentary state across tool change or spindle start logic
HVAC and building automation 24VDC relay switches damper actuator coils and fan contactor coils in building control panels

Electrical and Physical Specifications Worth Knowing Before You Order

Parameter Value Notes
Coil Voltage 24VDC BD suffix designates 24VDC coil; AC variants require a different catalog number
Coil Inrush Power 3W Compatible with standard industrial 24VDC power supplies; no supply sagging
Contact Form 2NO-2NC (4-pole) 2 normally-open + 2 normally-closed contacts; all four switch simultaneously
Contact Current Rating 10A continuous Free-air thermal rating; do not exceed in continuous operation
Rated Operational Voltage 690V maximum Load circuit must not exceed this voltage
Load Class Rating AC-15 / DC-13 Rated for electromagnetic inductive loads — solenoid coils, contactor coils
Operating Frequency 180 cycles/minute Handles frequent switching in moderate-duty applications
Ambient Temperature Range -25 to +50 degrees C No external cooling required in typical factory environments
DIN Rail Width 45mm Two relays fit in standard 90mm panel slot
Connection Type Screw clamp terminals Not plug-in; requires screwdriver; secure long-term termination

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

CA3KN22BD vs. CA3KN32 vs. Alternatives: Which One Do You Actually Need?

Model Brand Coil Voltage Contact Form Current Rating Notes
CA3KN22BD Schneider Electric 24VDC 2NO-2NC 10A This model; correct for loads up to 10A continuous
CA3KN32 Schneider Electric 24VDC 2NO-2NC 20A Upsized option; same coil and contact form; use only if 10A is insufficient
CA3KN14 Schneider Electric 24VDC 1NO-4NC 10A Different contact form; use only if 2NO-2NC is oversized for your logic
CA3KN11 Schneider Electric 24VDC 1NO-1NC 10A Simplified contact form; lower cost if only one NO and one NC needed
CR-P024DC2 ABB 24VDC 2CO 10A Direct competitor; similar specifications; pricing within 15% of Schneider
D26 Eaton 24VDC 2NO-2NC 10A Alternative; good availability; comparable pricing

If your load current calculation exceeds 7.5A continuous — after applying a 25–30% safety margin — the CA3KN32 is the correct choice, not a workaround. Check current availability of the CA3KN22BD and related TeSys K variants at LeadTime.ca.

Expert Verdict: Is the CA3KN22BD the Right Relay for Your Project?

The CA3KN22BD earns its place as a default spec in 24VDC control panels for one reason engineers return to it repeatedly: it solves the contact form problem and the certification problem simultaneously. The 2NO-2NC configuration handles bidirectional circuit logic from a single 45mm device, and the IEC/UL/CSA/VDE multi-standard certification set means the same catalog number satisfies documentation requirements for North American and European panel builds without substitution. For a systems integrator building custom automation panels for solenoid valve control, motor starter cascades, or PLC output interfacing — where loads fall comfortably under 10A continuous and the coil supply is 24VDC — this relay is a technically sound, well-supported choice with a stable supply chain.

The CA3KN22BD has real limits that matter at specification time. The 10A continuous rating leaves limited margin for loads that draw 8A or 9A — thermal derating in enclosed panels can reduce effective capacity below nameplate, and inrush current on cold solenoid coils temporarily exceeds steady-state draw. If your calculated load current after a 25–30% margin exceeds 7.5A, specify the CA3KN32 instead. If your coil supply is 110VAC or 230VAC rather than 24VDC, the BD suffix is the wrong part entirely — the suffix change in the TeSys K family is not cosmetic, it defines a fundamentally different coil. And if your logic only requires one contact form — only NO or only NC — the CA3KN22BD gives you contacts you won't use; the CA3KN11 (1NO-1NC) or a simpler variant is a cleaner fit for that application.

From a procurement standpoint, the CA3KN22BD is a mature, widely-stocked catalog item with no supply chain instability concerns at the time of writing. It is available through multiple industrial distributors worldwide. Ordering through a specialist distributor matters when you're confirming the exact suffix, verifying stock depth for a multi-unit panel build, or need a written lead time commitment before releasing a purchase order. Review current pricing and availability on the LeadTime.ca product page — if your specs align, the ordering process is straightforward.

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

What Engineers Need to Know Before Ordering the CA3KN22BD

Community discussion on the CA3KN22BD specifically is sparse — this is a mature, well-understood catalog component that rarely generates forum controversy. What surfaces consistently in industrial automation discussions about TeSys K and equivalent control relays are not product defects but ordering mistakes and installation errors that experienced engineers have learned to prevent. Because specialist advice on this product matters more than anecdotal community opinions, the following is a consolidated guide drawn from the most common specification and procurement errors in this product category.

The single most persistent ordering mistake across 24VDC relay families is coil voltage confusion. The CA3KN22BD catalog suffix BD designates the 24VDC standard coil. A different suffix — FA, for example — designates a different coil voltage entirely. Online procurement systems and mobile ordering apps make it easy to select the wrong variant from a dropdown list of dozens of TeSys K entries, especially when catalog numbers differ by only two characters. Engineers who have been burned by this report that the fastest prevention is a two-step check: confirm the coil voltage in your control system specification document before searching, and verify the product page title explicitly displays 24VDC before adding to cart.

The second recurring pattern is current margin miscalculation. The 10A continuous rating sounds conservative for most solenoid applications until you account for cold-start inrush current, panel enclosure thermal derating, and measurement error from estimated rather than datasheet-sourced coil current values. Engineers who specify control relays in high-cycle pneumatic systems report that loads calculated at 8A or 9A — close to the nameplate — cause contact degradation faster than expected. The professional practice is to obtain the actual load datasheet, calculate current at rated conditions, apply a 25–30% safety margin, and upgrade to the CA3KN32 if the result exceeds 7.5A. The cost difference is small; an early relay failure in a production line is not.

Finally, NO versus NC contact logic errors are more common than the terminology suggests. Normally-closed does not mean the contact is always closed — it means closed when the relay coil is unpowered. Wiring a solenoid to the NC contact pair when NO was intended results in the solenoid staying energized after the control signal drops, which can create an unsafe state that operators misidentify as a relay fault. Tracing the circuit logic on paper before live power — showing both the de-energized and energized states — takes five minutes and eliminates this class of error entirely.

Wiring and Installation Overview

The following is an overview of key installation requirements. Engineers needing full wiring diagrams and step-by-step procedures should refer to the Schneider Electric TeSys K installation documentation.

  • Mount the relay on a clean, dry 35mm DIN rail using the DIN rail clip, or screw-mount directly to an enclosure panel surface — the relay supports both configurations
  • Connect the 24VDC control signal to the coil terminals (typically labeled A1 and A2); use 18–22 AWG wire; confirm the supply reads 24VDC before connecting
  • Wire load devices to the NO contact pair for energize-to-activate logic (contacts open at rest, close when coil is energized), or to the NC contact pair for de-energize-to-activate logic (contacts closed at rest, open when coil is energized)
  • Use wire gauge appropriate for the load current on the contact side; verify the total connected load current does not approach or exceed the 10A continuous rating
  • Before connecting live loads, verify contact behavior by energizing the coil with 24VDC and confirming the audible click and correct continuity readings on both NO and NC terminal pairs using a multimeter

Wrong-Part Prevention: Verify Before You Order

Before placing your order for the CA3KN22BD, confirm each of the following points against your actual control system design:

  1. Confirm your PLC or control circuit actually outputs 24VDC (not 24VAC, not 12VDC, not 110VAC)
  2. Verify total load current does not exceed 10A continuous; check datasheet for your solenoid or motor coil
  3. Confirm load voltage is 690V or less (if using this relay to switch higher voltages, it will fail)
  4. Check that you actually need both NO and NC contacts; if only NO or only NC, this relay is oversized
  5. Measure DIN rail space available; relay is 45mm wide and cannot fit in extremely tight spaces
  6. Verify connection style: this model uses screw clamp terminals (not plug-in terminals); some TeSys K variants differ
  7. Confirm enclosure mounting surface is clean and dry; relay cannot mount on wet surfaces or conductive dust

If any of the above checks reveals a mismatch, contact the LeadTime.ca team to confirm the correct TeSys K variant before ordering — we stock multiple CA3KN configurations and can identify the right catalog number for your application.

Frequently Asked Questions

Can the CA3KN22BD handle a solenoid coil that draws 9A — is there any derating to account for?

The 10A rating is a free-air continuous thermal rating. Inside an enclosed panel with limited airflow, the effective thermal capacity is lower than the nameplate value. For a 9A load, you are operating at 90% of nameplate with no safety margin. Professional practice is to add 25–30% margin to your calculated load current; if the result exceeds 7.5A, upgrade to the CA3KN32 (20A rating, same 24VDC coil, same 2NO-2NC form). The incremental cost difference does not justify the risk of premature contact failure.

What does the BD suffix mean — how do I identify the coil voltage from the catalog number?

In the TeSys K naming convention, the suffix after the contact form designation identifies the coil voltage. BD designates the 24VDC standard coil. Different suffixes correspond to different coil voltages — 110VAC, 230VAC, and other options exist in the same CA3KN22 family. When ordering, the product page title and specification table must explicitly show 24VDC; do not assume from the base model number alone.

Is the CA3KN22BD a direct drop-in replacement for an older TeSys K relay with the same contact form?

The CA3KN22BD is the current production variant in the TeSys K family for the 2NO-2NC, 24VDC contact relay. If you are replacing an older CA3KN22 series relay with the same contact form and coil voltage, the physical footprint (45mm DIN rail width) and terminal layout are consistent within the TeSys K family. Verify the replacement's screw clamp terminal positions match your existing wiring before assuming a direct swap — confirm using the Schneider Electric product documentation.

What does a fault condition look like on this relay, and how do I diagnose it quickly on the panel floor?

Two failure modes are most common. First, if the coil is energized (24VDC confirmed at terminals with a multimeter) but no audible click occurs and continuity across the NO contact pair does not change, the coil is burned out or there is a mechanical failure — replace the relay. Second, if the coil is de-energized but the NO contacts still show continuity (near 0 ohms), the contacts are welded closed from overcurrent. This is a safety risk; do not attempt to free the relay mechanically — replace it immediately.

Does the CA3KN22BD need a suppression diode or snubber for 24VDC inductive loads?

The CA3KN22BD is rated AC-15/DC-13, meaning the contact material and geometry are engineered specifically for inductive electromagnetic loads including solenoid coils and contactor coils. The load class rating accounts for back-EMF behavior. However, for DC inductive loads with high inductance — particularly solenoid coils with long hold times — adding a flyback suppression diode across the load coil is good engineering practice and extends contact life regardless of relay brand or rating. Refer to the Schneider Electric TeSys K technical documentation for suppression recommendations specific to your load type.

Can I get the CA3KN22BD on short lead time for a breakdown replacement — is it typically in stock?

The CA3KN22BD is a mature, widely-distributed TeSys K catalog item with stable supply chain availability. It is carried by multiple industrial distributors globally. For confirmed stock status and current lead time at LeadTime.ca — including volume availability for panel builds — check the product page or contact the team directly for a rapid response.

Why Order From LeadTime.ca

  • LeadTime.ca ships the CA3KN22BD and TeSys K family components worldwide — no regional restriction on orders
  • Specialist distributor with expertise in industrial control components; can confirm the correct TeSys K variant for your application before you commit to a purchase order
  • Volume pricing available for panel builders and integrators ordering 10 or more units — contact for a quote
  • Fast response on stock confirmation and lead time commitments — useful for breakdown and urgent retrofit scenarios
  • Sourcing support for hard-to-find Schneider Electric catalog variants including legacy and current-production TeSys K models

At-a-Glance Summary

  • Coil voltage: 24VDC (BD suffix) — not available in AC coil variants under this catalog number
  • Contact form: 2NO-2NC, 4-pole — all four contacts switch simultaneously on coil energization
  • Contact current rating: 10A continuous, free-air — upgrade to CA3KN32 (20A) if load current exceeds 7.5A after margin
  • Rated operational voltage: 690V maximum on the load (contact) circuit
  • Load class: AC-15/DC-13 — rated for inductive electromagnetic loads including solenoid and contactor coils
  • Operating frequency: up to 180 cycles per minute
  • Ambient temperature: -25 to +50 degrees Celsius — no external cooling required in typical factory environments
  • DIN rail width: 45mm — two units fit in a standard 90mm panel slot
  • Connection type: screw clamp terminals — not plug-in; screwdriver required at installation
  • Certifications: IEC 60947-4-3, UL, CSA, VDE 0660, BS 5424, NF C 63-140, RoHS, REACH
  • Coil inrush power: 3W — compatible with standard industrial 24VDC power supplies
  • Weight: 0.50 lbs — no structural panel support required

You may also be interested in: