Schneider Electric CAD32M7 — 220V AC Control Relay Buying Guide

By Abdullah Zahid
14 min read
Schneider Electric CAD32M7 TeSys Deca control relay 3 NO 2 NC 220V AC DIN rail mount industrial panel

Schneider Electric CAD32M7 TeSys Deca Control Relay — 3 NO + 2 NC, 10A, 690V, 220V AC Standard Coil: Complete Specifications, Selection Guide, and Alternatives

Controls engineers and panel builders searching for CAD32M7 control relay specifications are typically at the final verification stage — part number confirmed, now checking coil voltage, contact configuration, and operating rate before committing to an order. The Schneider Electric CAD32M7 is a TeSys Deca control relay rated for a 220V AC 50/60Hz coil, 3 NO + 2 NC contact configuration, 10A per contact at up to 690V AC, with a 180 cycles/min maximum operating rate and a 30-million-cycle mechanical durability rating — all packed into a 45mm-wide DIN rail housing.

If you have already confirmed this is the correct part for your application, check current pricing and availability for the CAD32M7 at LeadTime.ca — ships worldwide.

Who Should Buy the CAD32M7 — and Who Shouldn't

The CAD32M7 is the right relay when all five of the following conditions are true for your application:

  • Your control signal source is 220V AC 50/60Hz — measured at the source, not assumed from the panel label
  • Your switching logic requires exactly 3 NO + 2 NC contacts (five total switching contacts, fixed configuration)
  • Your field circuit voltage does not exceed 690V AC and your load current per contact stays at or below 10A
  • Your application switching frequency does not exceed 180 cycles/min — calculate actual pulse frequency for pulsed applications before ordering
  • Your control panel uses a standard 35mm DIN rail and has clearance for a 45mm W x 77mm H x 84mm D housing

If your control signal is 24V DC, 110V AC, or any voltage other than 220V AC, this model will not function — you need a different coil voltage variant from the TeSys family. If your load exceeds 10A per contact, a larger industrial relay series is required.

On this page:

What the CAD32M7 Actually Does in a Control System

The CAD32M7 functions as an electrical amplifier between a low-power control circuit and a high-power field circuit. When a 220V AC pilot signal energizes the relay coil, an internal electromagnet pulls five mechanical contacts simultaneously — three normally open contacts close and two normally closed contacts open. This electromechanical action isolates delicate PLC outputs and control logic from the electromagnetic stress of switching contactors, solenoid valves, and other inductive loads.

The practical result is that a 220V AC control signal drawing just 8 VA in steady state — well within the drive capability of most auxiliary contacts and supervised relay outputs — can safely switch field circuits carrying up to 10A at voltages up to 690V AC. Because the CAD32M7 is purely electromechanical, it introduces no electronic components into the switching path. There is no firmware, no programming, and no driver software. If the coil is energized, the contacts move. If it is not, they return to rest. This deterministic behavior is exactly what high-reliability interlock and pilot relay applications require.

The 30-million-cycle mechanical durability rating and 180 cycles/min maximum operating rate are the two specifications that separate the CAD32M7 from lower-grade relays in the same price range. At 180 cycles/min, the relay performs 10,800 switching operations per hour — an important capability for solenoid valve sequencing, proportional fluid metering, and fast conveyor control applications where older electromechanical relays rated at 10–20 cycles/min are simply too slow.

Where the CAD32M7 Sits in a Typical System Architecture

The CAD32M7 occupies the interface layer between control logic and field power — it receives a pilot signal from the logic layer and gates a higher-power circuit to the load. A typical deployment chain looks like this:

  • PLC or control system outputs a digital signal at logic voltage (commonly 24V DC internally, routed through an output relay or interface module to produce a 220V AC switching signal)
  • The 220V AC pilot signal arrives at CAD32M7 coil terminals A1 and A2, drawing 70 VA inrush at energization and 8 VA continuously
  • The CAD32M7 NO contacts (terminals 1, 3, 5) close, completing the field circuit — typically energizing a TeSys contactor coil, solenoid valve, or auxiliary load
  • The CAD32M7 NC contacts (terminals 2, 4, 6) simultaneously open, which may de-energize an interlocked load, signal a fault monitor, or release an emergency shutdown circuit
  • Downstream field devices — motors via contactor, pneumatic or hydraulic valves, indicator circuits — respond to the switched field voltage up to 690V AC

Typical Applications and Deployment Scenarios

The most common deployment of the CAD32M7 is amplifying a PLC digital output to energize a motor starter contactor coil. In this configuration, the PLC output — which cannot safely drive a large contactor coil directly — switches the relay coil, and the relay contacts then switch the contactor coil. The 220V AC coil requirement makes this model particularly common in European-standard panel designs, legacy North American installations, and export equipment built to IEC conventions.

Solenoid-operated hydraulic and pneumatic valve control is the second major application. Proportional or sequencing applications that require the valve to pulse open and closed at high frequency depend on the 180 cycles/min capability of the CAD32M7. Earlier relay designs rated at 10–20 cycles/min cannot support this duty. The 30-million-cycle mechanical rating ensures that even at maximum operating rate, the relay delivers extended service life before requiring replacement.

The 3 NO + 2 NC contact configuration enables switchover relay logic — where one set of contacts routes power to Load A and the other routes power to Load B, with the two loads mutually exclusive. This is common in HVAC zone control, dual-pump selection circuits, and equipment interlock logic where one machine must be confirmed off before another starts.

In safety pilot relay duty for emergency shutdown or fault detection circuits, the NC contacts provide normally-closed signal continuity that is broken when the relay energizes or loses power — a fail-safe architecture that is common in HVAC, water treatment, and marine applications where the relay's Marine and CE certifications are also relevant.

Application Typical Deployment
Motor starter PLC interface PLC 220V AC output drives CAD32M7 coil; NO contacts energize TeSys contactor coil for motor start/stop
Solenoid valve sequencing Relay pulsed at up to 180 cycles/min to meter flow through solenoid-operated hydraulic or pneumatic valve
HVAC zone control switchover NO and NC contacts used simultaneously to select between two zone valve states; coil energized by thermostat or BMS signal
Emergency shutdown pilot relay NC contacts provide normally-closed interlock signal; relay de-energization on fault opens NO contacts and signals shutdown to upstream controller
Packaging automation interlock Relay interlocks two machine axes — NO contact confirms upstream device ready before downstream device receives start permission
Water treatment valve control CAD32M7 used as pilot relay in dosing pump circuit; Marine and IEC certifications support harsh environment compliance

CAD32M7 Specifications: What Engineers Need for Purchase Decisions

Parameter Specification Notes
Contact Configuration 3 NO + 2 NC (5 total contacts) Fixed; not field-adjustable
Coil Supply Voltage 220V AC, 50/60Hz Accepts 0.8–1.1 Uc at 50Hz; 0.85–1.1 Uc at 60Hz. No DC or other AC voltages supported
Rated Field Circuit Voltage Up to 690V AC, 25–400Hz Maximum voltage across any contact pair
Rated Current per Contact 10A at or below 60°C ambient De-rates above 60°C; verify for hot cabinets
Coil Power — Hold-in 8 VA at 20°C, 50Hz Continuous power draw while coil is energized
Coil Power — Inrush 70 VA at 20°C, 50Hz Peak transient at energization; control supply must tolerate this
Maximum Operating Rate 180 cycles/min Exceeding this causes thermal stress and contact failure
Mechanical Durability 30 million cycles At 180 cycles/min, equates to 2,777 hours of continuous operation
Operating Temperature Range -40°C to +70°C Current rating de-rates above 60°C
Dimensions (W x H x D) 45mm x 77mm x 84mm DIN rail (35mm) or screw mount; any orientation supported

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

CAD32M7 vs. TeSys Family Variants — Which One Do You Actually Need?

Model Coil Voltage Contact Configuration Key Difference vs. CAD32M7 When to Choose
CAD32M7 220V AC 50/60Hz 3 NO + 2 NC This model 220V AC control circuits requiring 3 NO + 2 NC configuration
CA2D32M7 / CAD32E7 24V DC 3 NO + 2 NC DC coil — for PLC direct-drive or 24V DC control circuits Facilities standardized on 24V DC control voltage
CAD32B7 (110V AC variant) 110V AC 50/60Hz 3 NO + 2 NC 110V AC coil — for North American 110V pilot supply systems Panels with 110V AC pilot supply infrastructure
CAD24M7 220V AC 50/60Hz 2 NO + 2 NC (4 contacts) One fewer NO contact; lower contact count Logic requiring only 4 total contacts, same coil voltage
CA2DN31M7 220V AC 3 NO + 1 NC Older predecessor — fewer NC contacts, lower cycle rating Replacement for existing legacy installations only
CA2DN22M7 220V AC 2 NO + 2 NC Older predecessor — different contact ratio, lower cycle rating Replacement for existing legacy installations only

If your control circuit is 24V DC — as is common in modern PLC systems across North America — the CAD32M7 will not function. Verify your coil supply voltage before ordering. Check current availability of the CAD32M7 and TeSys family variants at LeadTime.ca.

Expert Verdict: Is the CAD32M7 the Right Relay for Your Application?

The CAD32M7 is well-suited to manufacturing facilities, OEMs, and panel builders operating with 220V AC control voltage infrastructure — common in IEC-standard automation environments, European-designed equipment, and legacy North American industrial installations where 220V AC pilot circuits are standard. The combination of 180 cycles/min maximum operating rate, 30-million-cycle mechanical durability, and a compact 45mm-wide housing makes it a strong choice for high-frequency solenoid valve sequencing, motor starter pilot relay duty, and equipment interlock circuits where older electromechanical relays fall short on speed or cycle life. For global OEMs and multinational integrators, the single SKU carrying simultaneous CB, CCC, UL, CSA, EAC, CE, UKCA, and Marine certifications eliminates the cost and delay of sourcing regional variants — a meaningful procurement advantage at scale.

Where the CAD32M7 has real limits: it is strictly an AC coil relay and will not operate on 24V DC or 110V AC control signals. If your panel uses 24V DC logic — the dominant control voltage in modern PLC-driven systems — you need a 24V DC coil variant such as the CAD32E7. If your field load exceeds 10A per contact, a larger relay from the TeSys F or TeSys U series is the correct choice. For applications pulsing above 180 cycles/min, a solid-state relay (SSR) removes the mechanical switching constraint entirely. And for emergency stop or safety interlock circuits requiring certified safety function per ISO 13850, a force-guided safety relay replaces this general-purpose model — the CAD32M7 carries no safety relay certification.

From a procurement standpoint, the CAD32M7 is a standard stocked item through authorized Schneider Electric distributors, with typical fulfillment of one to two business days from stock and five to ten business days for special-order quantities. Buyers standardizing control panel BOMs on this relay benefit from its stable catalog position and multi-certification footprint. For volume pricing, build-specific configurations, or to confirm stock before locking in a project BOM, view current pricing and availability at LeadTime.ca — the team ships worldwide and can confirm lead time before you commit.

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 CAD32M7

The CAD32M7 does not generate a large public forum footprint — it is a stable, mature component that tends to work correctly when specified correctly, which means engineers who get it right rarely post about it. What this absence of community noise does signal is that the most common problems with this relay are pre-order specification errors rather than field failures. The technical documentation is thorough, but the three failure modes that appear consistently in control relay applications of this type are worth surfacing before you place an order.

Coil voltage mismatch is the most costly mistake. A controls engineer specifying a replacement relay in a busy facility may see "Schneider control relay" on the maintenance request and assume the coil is 24V DC — the dominant voltage in modern PLC output circuits. The CAD32M7 coil requires 220V AC. Installing a 220V AC relay on a 24V DC control circuit produces exactly nothing: the relay sits permanently de-energized, the downstream load never receives power, and the resulting troubleshooting loop typically consumes two or more days before the coil voltage mismatch is discovered. The fix is to measure the control signal source voltage with a multimeter before selecting any relay — not to read the panel label, and not to assume from the part number.

The second recurring mistake is exceeding the 180 cycles/min operating rate in pulsed applications. An engineer designing a proportioning valve circuit may calculate the required pulse frequency as 250 cycles/min and choose the CAD32M7 because it fits the panel and matches the budget. At 250 cycles/min — 39% above the rated maximum — the relay contacts overheat, become sluggish, and eventually weld together, locking the downstream load in an energized state. The correct approach for applications above 180 cycles/min is a solid-state relay designed for high-frequency switching. Calculate actual cycle frequency before selecting the relay, not after. The third mistake — installing a 10A-rated relay on a 12A contactor coil load — follows the same pattern: a maintenance technician uses what is available rather than what is specified. The contact surfaces arc beyond their rated capacity and the relay fails, often in a latched-on state. Always cross-check load current against the 10A contact rating before specifying the CAD32M7 as a drop-in replacement.

When community feedback is sparse and the datasheet is dense, working with a specialist distributor who has handled the selection and sourcing of this product family is a practical shortcut. The LeadTime.ca team can confirm coil voltage variant, contact configuration, and lead time in a single conversation — reach out before you order if any specification is uncertain.

Wiring and Installation Overview

The CAD32M7 supports both 35mm DIN rail snap-mount and screw panel mount. No tools are required for DIN rail installation — the rear clip seats and clicks into place. Key points to verify before and during installation:

  • Coil terminals A1 and A2 accept the 220V AC 50/60Hz control signal — polarity does not matter for AC; strip 5–8mm of insulation and use 1–4mm² flexible copper wire (or 1–2.5mm² with ferrule)
  • Tighten all M3 screw clamp terminals to 1.2 N·m using a Phillips #2, flat 6mm, or Pozidriv #2 screwdriver — loose terminals cause intermittent operation in vibrating environments; over-tightening crushes wire insulation
  • NO contact terminals (1, 3, 5) close when coil is energized — connect normally-off loads here; NC contact terminals (2, 4, 6) open when coil is energized — connect normally-on or emergency interlock loads here
  • Verify load current does not exceed 10A per contact and load voltage does not exceed 690V AC before energizing; also verify minimum switching voltage (17V) and minimum switching current (5mA) thresholds are met for low-energy signal circuits
  • After installation and before live commissioning, confirm relay coil energizes by applying 220V AC to A1/A2 — a soft mechanical click confirms contact actuation; no click with verified voltage present indicates a wiring or coil fault requiring investigation before proceeding

For complete wiring diagrams, terminal layout drawings, and detailed installation procedures, refer to the official Schneider Electric CAD32M7 datasheet and installation guide available from se.com.

Compatible System Components and Expansion

The CAD32M7 is designed for integration within the broader TeSys Deca and TeSys D product ecosystem. The following components are commonly used alongside or upstream of the CAD32M7 in panel designs:

  • TeSys D contactors — the CAD32M7 is frequently used as a pilot relay to drive the coil of a TeSys D motor starter contactor in DOL and reversing starter circuits
  • TeSys F and TeSys U series contactors — for higher-power applications where the CAD32M7 pilot relay gates a larger contactor coil
  • Schneider Electric Harmony XPSAF and XPS safety relay range — for applications where safety-certified force-guided relay function is required adjacent to the general-purpose CAD32M7 in the same panel
  • Schneider Electric Acti9 and Easypact auxiliary contact blocks — upstream circuit protection and auxiliary signaling commonly paired with TeSys control relays in the same DIN rail assembly
  • TeSys spring terminal variants of the CAD series — where panel assembly speed is a priority, spring-clamp terminal versions of the same CAD relay family are available as an alternative wiring method

Wrong-Part Prevention Checklist

Before placing your order for the CAD32M7, verify every item on this list. These are the six checks that prevent returns, schedule delays, and field failures:

  1. Confirm your control signal source voltage is 220V AC 50/60Hz by measuring with a multimeter at the source - not 24V DC, not 110V AC, not any other voltage
  2. Verify the exact contact configuration required (this model has 3 NO + 2 NC; confirm this matches your load switching logic)
  3. Check that your field circuit load voltage does not exceed 690V AC and current does not exceed 10A per contact
  4. Confirm the application pulse or cycle frequency does not exceed 180 cycles/min (for pulsed applications, calculate the frequency first)
  5. Verify DIN rail mounting is compatible with your panel's 35mm rail spacing and that adjacent devices leave clearance for the relay's 84mm depth
  6. Check that your available cable gauge (typically 1-4mm² flexible copper) matches the relay screw clamp terminal specifications

If any item on this list is uncertain, contact the LeadTime.ca team before ordering — confirming the correct variant takes minutes and avoids days of delay from a wrong-part return.

Frequently Asked Questions

Can the CAD32M7 coil be driven directly from a 24V DC PLC output?

No. The CAD32M7 coil requires 220V AC 50/60Hz. A 24V DC signal has no effect on this coil and will not energize the relay. For PLC systems operating on 24V DC logic, the correct variant is a 24V DC coil version such as the CAD32E7. Always measure the control signal source voltage with a multimeter before specifying the coil voltage variant.

What happens if my application runs the relay at 250 cycles/min — above the 180 cycles/min rated maximum?

Operating the CAD32M7 above 180 cycles/min causes accelerated thermal stress on the contacts and internal coil assembly. In practice, contacts may overheat, become sluggish, and eventually weld together — locking the downstream load in a permanently energized state. For applications requiring switching above 180 cycles/min, a solid-state relay (SSR) without mechanical contacts is the correct choice for this duty.

Is the CAD32M7 a direct drop-in replacement for the older CA2DN31M7 or CA2DN22M7?

The CAD32M7 is the current TeSys Deca successor to the older CA2DN31M7 and CA2DN22M7 predecessor models. The coil voltage (220V AC) and DIN rail mounting are compatible, but the contact configuration differs: the CA2DN31M7 has 3 NO + 1 NC contacts while the CAD32M7 has 3 NO + 2 NC. Verify that the additional NC contact does not create an unintended circuit path in your existing wiring before treating it as a direct swap. The CAD32M7 also carries a significantly higher 30-million-cycle mechanical durability rating compared to older designs.

Can I use the CAD32M7 in a safety relay application for an emergency stop circuit?

The CAD32M7 is a general-purpose control relay and does not carry safety relay certification (such as ISO 13850 force-guided contact certification). It is not appropriate as the primary safety device in a certified emergency stop or safety interlock circuit. For safety-critical applications requiring certified relay function, a Schneider Electric Harmony XPS or equivalent force-guided safety relay is required. The CAD32M7 can be used as a secondary pilot relay in safety circuits, but must not be the certified safety function element.

The relay contacts are rated 10A — can I connect multiple loads totaling more than 10A across different contacts?

Each contact is independently rated at 10A maximum.

You may also be interested in: