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Siemens 3RU21160GB0 thermal overload relay, compact grey housing, screw terminals, direct contactor mount

SIEMENS

SIEMENS 3RU21160GB0 Overload Relay 0.45-0.63 A 690 V AC

SKU CH-W5AW-7Q4FG

Thermal overload relay protects motors at 0.45–0.63 A with 690 V AC rating and trip class 10

  • Thermal protection for motors up to 0.63 A
  • Trip Class 10 ensures reliable overload response
  • 690 V AC rating suits industrial power systems
  • Auto and manual reset options for flexible recovery
  • Direct contactor mounting simplifies panel assembly

SIEMENS 3RU21160GB0 Overload Relay

The SIEMENS 3RU21160GB0 is a thermal overload relay designed for motor protection in industrial control panels. It suits electricians and maintenance engineers who need reliable overload monitoring for three-phase motors up to 690 V AC.

Direct contactor mounting

This relay mounts directly onto a compatible SIRIUS contactor, reducing panel wiring time. The package includes the required three thermal units, and the unit offers both automatic and manual reset modes for flexible recovery after a trip event.

Verify contactor compatibility

Ensure your contactor matches the SIRIUS series and S00 frame size for direct mounting. Confirm the motor full-load current falls between 0.45 A and 0.63 A, and that your control circuit uses screw terminals for connection.

How it compares

Measured against everything we stock in Contactors, Relays & Motor Starters, at today’s prices. Recalculated every night.

Price $62.99
Typical for this category: the median of 1,098 items is $61.99.

Specifications

Product
Brand nameSIEMENS

Questions about this item

Will the thermal units inside this 3RU21160GB0 relay need periodic replacement?

The relay includes thermal units that are built for continuous operation; they are not a scheduled maintenance item unless a trip event indicates damage.

What stops the 0.63 A maximum current setting from being exceeded during prolonged motor starts?

Trip Class 10 limits the time the relay will carry overload current before opening the 1NO/1NC auxiliary contacts.

How much heat does the S00 frame generate when mounted directly to a contactor and run all day at 690 V AC?

The thermal overload design dissipates heat through the screw terminals and direct contactor mounting, keeping temperature rise within IEC limits for continuous duty.

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