Schneider Electric RXM3AB1B7 Harmony RXM Relay 24 V AC

RXM3AB1B7: RXM3 miniature relay, 24 V AC coil

The RXM3AB1B7 is an RXM-series miniature plug-in relay with 3 changeover contacts rated 10 A, a 24 V AC coil, no status LED and a lockable test button. It belongs to the Schneider Electric Harmony electromechanical relay range and is built for panel and marshalling-cabinet duty, where it plugs into a socket instead of being wired directly. Seven Star LLC supplies the RXM3AB1B7 in Oman and the GCC as an independent supplier based in Muscat.

Reading the reference as our own pattern across the RXM3A group, and not as a published ordering table: RXM3 gives the contact count, AB the high-rating body, the digit 1 (without an LED) and the closing code B7 the coil, here 24 V AC.

RXM3AB1B7 technical specifications

All figures above come from the Schneider Electric product datasheet for the RXM3AB1B7, which carries the print date 8 Nov 2026. The sheet shows no discontinuation notice for this reference.

Typical applications in Oman and the GCC

Three changeover contacts allow one coil to switch a load, repeat its status and feed an interlock, which reduces the relay count in compact marshalling and control panels. Panels in Oman and the wider Gulf see high ambient temperatures, dust and humidity, so relays should be installed in ventilated, sealed cabinets and the temperature limits (operation -40–55 °C) kept in mind when panels sit in the sun. Seven Star LLC supplies the RXM3AB1B7 for panel builders, maintenance teams and projects in oil and gas, power, desalination and general industry.

Coil data and operating range of the RXM3AB1B7

A 24 V AC coil is fed from a small control transformer inside the panel, a practice that persists in older HVAC and machine-control cabinets and in panels built around transformer-fed pilot circuits.

The datasheet gives operating voltage limits of 19.2–26.4 V AC, with a drop-out threshold of ≥ 0.15 Uc. The average coil resistance is 180 Ohm at 20 °C ± 15 % and the average consumption is 1.2 VA at 60 Hz. Those numbers matter more than the nominal voltage: a supply that sags under load, or that sits at the top of its tolerance, should still fall inside the stated window for RXM3AB1B7 to pick up and release cleanly.

Because this is an AC coil, the contacts follow the supply frequency of 50/60 Hz; the relay is not meant for a rectified or unsmoothed DC feed, and an AC coil must not be fitted where a DC coil was specified.

Contact capability of the RXM3AB1B7 relay

The 3 changeover contacts carry a load current of 10 A at 250 V AC; 10 A at 28 V DC, with a maximum switching capacity of 2500 VA/280 W and a continuous output current of 6.7 A. The contact material is AgNi. The normally closed side is rated lower than the normally open side, at 5 A on IEC duty, so check which contact your load uses.

Rated operational currents on the datasheet include 10 A at 28 V (DC) NO conforming to IEC ; 10 A at 250 V (AC) NO conforming to IEC ; 5 A at 28 V (DC) NC conforming to IEC ; 5 A at 250 V (AC) NC conforming to IEC. Mechanical durability is 10000000 cycles cycles and electrical durability for a resistive load is 100000 cycles for resistive load. Operating rate is up to 1200 cycles per hour under load.

The dielectric strength is 1300 V AC between contacts with micro disconnection; 2000 V AC between coil and contact; 2000 V AC between poles.

Selection checklist for this relay

• Coil voltage and type: 24 V AC. Match both the voltage and AC or DC to the supply that actually feeds the coil.
• Contact count and load: 3 changeover contacts, 10 A at 250 V AC; 10 A at 28 V DC; confirm the NC contact rating if the load is on the NC side.
• Indication: no LED, so status must be read from the controller or by a lamp elsewhere in the circuit.
• Test facility: lockable test button fitted.
• Socket: the relay has Flat (faston type) pins, so choose a matching socket from the same Harmony range and confirm its reference with your supplier.
• Environment: operating temperature -40–55 °C and IP40 conforming to IEC 60529; as a plug-in relay it belongs inside a panel, not on an open plant floor.

Installation, commissioning and maintenance

Seat the relay squarely so that all pins engage, fit the retaining clip, and keep the three contact sets segregated in the wiring so that one failed circuit does not feed another. The permitted ambient is -40–55 °C, and the net weight is 0.037 kg.

Use the lockable test button during commissioning to prove the downstream circuit, then release it and note that in the commissioning record. A relay is a wear item: keep spare relays of the same coil voltage and replace them on a schedule defined by the duty, not only after a failure.

Comparing this relay with related references

The table below lists the RXM3AB1B7 next to the closest references from the same group, ordered by coil voltage, so that you can check that you are specifying the right coil and indicator combination.

Information to send with an RFQ

• The exact part number RXM3AB1B7 and the quantity, remembering the pack quantity of the reference.
• The coil voltage on site, 24 V AC here, and the supply tolerance.
• The socket reference or the existing relay being replaced.
• The load type and current on each contact.
• The delivery location and whether the relays are for a project or maintenance stock.

Documents and quotation

The Schneider Electric datasheet for the RXM3AB1B7 is attached on this page, and the figures above come from it. Always check the latest revision before final design.

To obtain a quotation, send us the part number RXM3AB1B7 with the quantity and delivery location, and we will respond with availability and lead time. Seven Star LLC is an independent supplier and does not claim any official status with the manufacturer.