Schneider Electric RXG21B7 RXG Relay 24 V AC

RXG21B7 RXG interface plug-in relay and its part number

RXG21B7 is an RXG interface plug-in relay from the Schneider Electric Harmony Electromechanical Relays range. Its datasheet lists 2 C/O contacts, an AC coil rated 24 V AC, and no status LED. Mounting is plug-in, with flat faston-type pins.

Reading the code from the datasheets of this family: RXG = RXG series interface relay; the first digit after it gives the contact count (2 C/O), the second distinguishes versions without and with LED, and the suffix B7 identifies the coil, here 24 V AC. This reading follows how the sibling datasheets line up and is not an ordering table, so verify the full code against the manufacturer catalogue when it matters.

Seven Star LLC supplies RXG21B7 in Oman and the GCC as an independent supplier in Muscat. The datasheet we hold is dated 8 Nov 2026.

Coil circuit and supply window of RXG21B7

The coil of RXG21B7 is rated 24 V AC. The datasheet gives an average coil resistance of 260 Ohm at 23 °C ± 10 %. The relay releases when the control voltage falls to ≥ 0.3 Uc AC, which is the figure to compare against any sagging control supply or leakage from a PLC output.

The datasheet shows operate and release times of 20 ms each, and a mechanical flag as local signalling, so contact position can be seen at the front even without an LED. This version has no LED, so the flag is the only local indication.

A 24 V AC coil normally comes from a control transformer; confirm the transformer rating covers the coil load of every relay on it and that the secondary is fused.

RXG21B7 technical specifications

Sockets and related parts for RXG21B7

The datasheets we hold do not name a specific socket for this relay, so confirm the socket against Schneider Electric documentation or ask us to check before ordering.

The same series also includes the following parts, which share the basic body of RXG21B7 but differ as shown:

• Against RXG12BD: coil 24 V AC against 24 V DC on RXG12BD; no LED against an LED on RXG12BD; 2 C/O contacts against 1 C/O on RXG12BD.
• Against RXG21JD: coil 24 V AC against 12 V DC on RXG21JD; drop-out ≥ 0.3 Uc AC against ≥ 0.1 Uc DC on RXG21JD.
• Against RXG21P7: coil 24 V AC against 230 V AC on RXG21P7.
• Against RXG22BD: coil 24 V AC against 24 V DC on RXG22BD; no LED against an LED on RXG22BD; drop-out ≥ 0.3 Uc AC against ≥ 0.1 Uc DC on RXG22BD.

Because the differences are in the coil or contact details, the complete part number must be confirmed before ordering.

Installation, commissioning and maintenance

Plug the relay into its socket with the supply isolated. The datasheet for RXG21B7 lists IP rating IP40 and an ambient range of -40–70 °C for operation. Route coil wiring away from contact wiring where possible, to limit coupling between the two circuits.

During commissioning, energise the coil at its nominal voltage, check contact transfer with a meter, and verify that the supply stays inside the voltage limits. In service, inspect for discoloured pins, replace relays that show contact wear, and keep a spare on the shelf for critical interlocks.

Selection and ordering checklist for RXG21B7

Before ordering RXG21B7 confirm:

• Control voltage: 24 V AC; AC and DC versions are not interchangeable.
• Contact load: check the load against 1250 VA and the current table above.
• Indicator needs: this version is without a status LED, with a mechanical flag.
• Socket type and terminal style matching the relay pins.
• Quantity and whether a spare relay should be held for the plant.

Contact ratings and switching limits

Contact data for RXG21B7: maximum switching capacity 1250 VA, minimum switching capacity 50 mW at 10 mA, 5 V DC; contact material Silver alloy (AgSnO2In2O3).

Rated operational current entries:

• 5 A at 30 V (DC) conforming to UL
• 5 A at 30 V (DC) conforming to IEC
• 5 A at 250 V (AC) conforming to UL
• 5 A at 250 V (AC) conforming to IEC

Durability: 100000 cycles for NO resistive load at 55 °C and 100000 cycles for NC resistive load at 55 °C. Derate for inductive or DC loads and follow the curves in the datasheet.

Typical use of RXG21B7 in Oman and the GCC

Typical installations are marshalling and interface panels in desalination, power and petrochemical plants, plus building services, where a replaceable relay keeps maintenance quick. Heat inside sun-exposed cabinets and salt-laden coastal air are the main points to design for; the datasheet lists pollution degree 2 and IP rating IP40.

RXG21B7 suits panels that need 2 C/O switching with no status LED and a lockable test button, and where the supply is 24 V AC.

Family comparison and RFQ details

For a quotation on RXG21B7 please send the exact part number, quantity, coil voltage, delivery location in Oman or the GCC and any project reference. If your drawing lists a different coil voltage, say so and we will check the matching variant.

Documents and quotation

The datasheet for this unit is attached to this page (document dated 8 Nov 2026). Please treat it as the reference for every figure above, and tell us if your project specification asks for anything the datasheet does not state.

Send the part number, quantity, required delivery point and any project reference through the quotation form or by email. Seven Star LLC is an independent industrial supplier based in Muscat, serving customers across Oman and the GCC, and we reply with availability and lead time for this exact part number.