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Compact grey IEC overload relay with screw terminals and direct contactor mounting

SIEMENS

SIEMENS 3RB31134SB0 Overload Relay 3-12 A 690 V AC

SKU CH-Y0PD-NC6F6

Protects three-phase motors with adjustable 3–12 A overload settings and selectable trip classes up to 690 V AC

  • Wide 3-12 A range covers diverse motor loads
  • Selectable 5E-30E trip classes match application needs
  • 690 V AC rating suits industrial power systems
  • Direct contactor mounting speeds panel assembly
  • Screw terminals give secure, tool-friendly wiring

SIEMENS 3RB31134SB0 Overload Relay

The SIEMENS 3RB31134SB0 is a three-pole overload relay rated for 690 V AC and designed for direct mounting on SIRIUS S00 contactors. It protects motors in industrial control panels by interrupting the circuit when current exceeds the set threshold.

Adjustable 3-12 A Trip Range

The relay offers a continuous current setting from 3 A to 12 A with selectable trip classes 5E, 10E, 20E and 30E. This single range determines whether the device matches the motor's full-load current and the required starting-time protection.

Direct Contactor Mounting

Screw terminals accept standard control wiring and the unit clips straight onto a compatible SIRIUS S00 contactor without extra brackets. Incorrect trip-class selection or a current setting outside the 3-12 A window are the most common causes of nuisance tripping or missed protection.

How it compares

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

Price $183.99
Pricier than about 90% of the 1,098 comparable items (median $61.99).

Specifications

Product
Brand nameSIEMENS

Questions about this item

What does the 12 A maximum current setting mean for motor protection in a live circuit?

The relay trips when motor current exceeds 12 A, protecting windings from sustained overload within the 3 A to 12 A adjustment range.

How does the 690 V AC rating limit the supply voltage I can connect?

The relay is rated for up to 690 V AC control circuits; do not apply higher phase-to-phase voltages to the main or auxiliary terminals.

What contactor frame size and mounting method does the 3RB31134SB0 require?

It mounts directly on SIRIUS S00 frame contactors using screw terminals, with no separate thermal units needed.

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