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Siemens 3RH21311BB40 control relay, grey plastic DIN-rail housing, screw terminals

SIEMENS

SIEMENS 3RH21311BB40 control relay 3NO/1NC 24V DC 10 A

SKU CH-EHVW-YYQFE

IEC control relay with 3NO/1NC contacts, 24 V DC coil, and 10 A rating

  • IEC-standard relay for reliable industrial control
  • 3NO/1NC contact form switches multiple circuits
  • 24 V DC coil suits low-voltage panels
  • 10 A rating at 24 V handles power loads
  • DIN-rail and surface mount simplifies installation

Industrial control relay for automation panels

This SIEMENS IEC control relay provides 3NO/1NC contacts rated at 10 A for 24 V DC circuits. The coil operates on 24 V DC with a power consumption of 4 W. It mounts on DIN rail or surface brackets and carries an IP20 rating. The S00 frame size matches the 3RH21 series footprint.

Suits panels switching small DC loads up to 10 A

Engineers wiring 24 V DC control circuits with screw terminals will find the contact ratings and coil voltage a direct fit. Buyers who need higher DC voltage breaking capacity or AC coil operation should look at other relay families. The fixed 3NO/1NC contact arrangement also limits use where different pole counts are required.

Coil voltage 24 V DC decides compatibility

The 24 V DC coil voltage is the single specification that determines whether this relay works in a given control circuit. Matching the coil supply to this value is essential before purchase. All other ratings follow from this core parameter.

How it compares

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

Price $78.99
Pricier than about 62% of the 1,098 comparable items (median $61.99).

Specifications

Product
Brand nameSIEMENS

Questions about this item

What does the 10 A rating mean when the relay is controlling a 24 V DC load?

At 24 V DC the contacts are rated for the full 10 A, so a 10 A resistive load can be switched directly.

What does the 24 V DC coil voltage imply for the control circuit?

The coil requires a 24 V DC supply and draws 4 W, so the control circuit must provide that voltage and power level.

How is the relay mounted and wired in the panel?

It mounts on a DIN rail or can be surface-mounted, and all connections are made with screw terminals.

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