Send a part number, a photo, or a whole BOM — we supply it and stand behind it. Worldwide shipping to 80+ countries.

Siemens Control Relay: DIN-Rail & Surface Relay Mounting, 230V AC Coil Volt, 4NO - Combination DIN-Rail & Surface-Mounted Relays
SiemensCombination DIN-Rail & Surface-Mounted Relays

Siemens Control Relay: DIN-Rail & Surface Relay Mounting, 230V AC Coil Volt, 4NO

SKU 3G-OTH-37427

Brand
Siemens
Item
Control Relay: DIN-Rail & Surface Relay Mounting, 230V AC Coil Volt, 4NO
Category
Combination DIN-Rail & Surface-Mounted Relays
Available to Order
Trade pricing by quote — replies within 24h
Qty
WhatsApp an engineer
No account needed — your quote request goes straight to our engineers. A free account lets you track quotes and re-order faster.
Worldwide Shipping
Air & sea freight
Datasheet on Request
Technical specs
1-Day Quote
Replies within 24h

Technical Specifications

Siemens
Manufacturer Part Number
3RH21401AP00
Type
4NO, 10 A
AC Coil Volt
230V
View Full Spec Sheet

Technical Documents

No technical documents available for this product.
Request documentation
Not sure this is the right part? Get a recommendation.

Need installation or engineering help?

Installation, commissioning, maintenance plans, system design, and bundled product + service quotes — one team handles the full scope.
Talk to an engineer

Ask a question

Siemens Products
3G Electric (S) Pte. Ltd. — Singapore

Frequently Asked Questions

What is the Siemens 3RH21401AP00 control relay used for?

The Siemens 3RH21401AP00 is an IEC control relay used for switching and controlling industrial loads in automation, motor control centers, and panel building. Its 4NO contacts and 10 A rating suit general-purpose switching in machinery, conveyors, and process equipment across 14 industrial departments.

What are the specifications of the Siemens 3RH21401AP00 relay?

The Siemens 3RH21401AP00 is a combination DIN-rail and surface-mount relay with 4 normally open contacts rated at 10 A. It operates on a 230 V AC coil voltage. The part number is 3RH21401AP00, and it is designed for IEC control circuits in industrial environments.

Where to buy Siemens 3RH21401AP00 relays worldwide?

3G Electric supplies the Siemens 3RH21401AP00 control relay to customers worldwide. We handle full logistics, customs clearance, and delivery to your site. As a global industrial solutions provider, we source genuine Siemens parts and support your procurement from inquiry to arrival.

How to install a Siemens 3RH21401AP00 control relay?

Mount the Siemens 3RH21401AP00 on a DIN rail or surface using the integrated clip. Wire the 230 V AC coil to terminals A1 and A2, and connect load circuits to the 4NO contact terminals. Ensure the coil voltage matches your supply and that contacts are rated for your load current.

Used in

Common applications for Siemens
District cooling plants — LME73 + RWF55 for condenser-water modulation
Inflight catering and food-processing steam boilers — LMG22 with SQN90 air-fuel cross-damper
Hospital steam-plant redundancy — LME41 with QRA2 UV flame detection for dual-fuel boilers
Semiconductor fab process heat — LME23 and SKP55 gas valves on hot-oil heater skids
Container-terminal reefer-deck heating — LMG22 retrofit onto legacy burner racks

Siemens Products

3G Electric supplies Siemens combination din-rail & surface-mounted relays. We supply genuine products with in-stock availability on common SKUs, technical documentation, commissioning support, and warranty service — worldwide.

You might also need

Burners & Combustion Pumps & Compressors Spare Parts All Products

Similar products

Matched by specification & description
SIEMENS IEC Control Relay: DIN-Rail & Surface Relay Mounting, 120V AC Coil Volt, 4NO, 10 A (MPN 3RH21401AF00). Key specifications — Brand: SIEMENS.
Siemens
SIEMENS IEC Control Relay: DIN-Rail & Surface Relay Mounting, 120V AC Coil Volt, 4NO, 10 A (MPN 3RH21401AF00). Key specifications — Brand: SIEMENS.
SIEMENS IEC Control Relay: DIN-Rail & Surface Relay Mounting, 240V AC Coil Volt, 4NO, 10 A (MPN 3RH21401AN20). Key specifications — Brand: SIEMENS.
Siemens
SIEMENS IEC Control Relay: DIN-Rail & Surface Relay Mounting, 240V AC Coil Volt, 4NO, 10 A (MPN 3RH21401AN20). Key specifications — Brand: SIEMENS.
SIEMENS IEC Control Relay: DIN-Rail & Surface Relay Mounting, 120V AC Coil Volt, 2NO/2NC, 10 A (MPN 3RH21222AK60). Key specifications — Brand: SIEMENS.
Siemens
SIEMENS IEC Control Relay: DIN-Rail & Surface Relay Mounting, 120V AC Coil Volt, 2NO/2NC, 10 A (MPN 3RH21222AK60). Key specifications — Brand: SIEMENS.
SIEMENS IEC Control Relay: DIN-Rail & Surface Relay Mounting, 230V AC Coil Volt, 2NO/2NC, 10 A (MPN 3RH21221AP00). Key specifications — Brand: SIEMENS.
Siemens
SIEMENS IEC Control Relay: DIN-Rail & Surface Relay Mounting, 230V AC Coil Volt, 2NO/2NC, 10 A (MPN 3RH21221AP00). Key specifications — Brand: SIEMENS.
SIEMENS IEC Control Relay: DIN-Rail & Surface Relay Mounting, 120V AC Coil Volt, 3NO/1NC, 10 A (MPN 3RH21312AF00). Key specifications — Brand: SIEMENS.
Siemens
SIEMENS IEC Control Relay: DIN-Rail & Surface Relay Mounting, 120V AC Coil Volt, 3NO/1NC, 10 A (MPN 3RH21312AF00). Key specifications — Brand: SIEMENS.
SIEMENS IEC Control Relay: DIN-Rail & Surface Relay Mounting, 24V DC Coil Volt, 5NO/3NC, 10 A (MPN 3RH22531BB40). Key specifications — Brand: SIEMENS.
Siemens
SIEMENS IEC Control Relay: DIN-Rail & Surface Relay Mounting, 24V DC Coil Volt, 5NO/3NC, 10 A (MPN 3RH22531BB40). Key specifications — Brand: SIEMENS.

More from Siemens

View all Siemens parts
SIEMENS IEC Control Relay: DIN-Rail & Surface Relay Mounting, 110V DC Coil Volt, 4NO, 10 A (MPN 3RH21401BF40). Key specifications — Brand: SIEMENS.
Siemens
SIEMENS IEC Control Relay: DIN-Rail & Surface Relay Mounting, 110V DC Coil Volt, 4NO, 10 A (MPN 3RH21401BF40). Key specifications — Brand: SIEMENS.
SIEMENS IEC Control Relay: DIN-Rail & Surface Relay Mounting, 24V DC Coil Volt, 3NO/1NC, 10 A (MPN 3RH21312FB40). Key specifications — Brand: SIEMENS.
Siemens
SIEMENS IEC Control Relay: DIN-Rail & Surface Relay Mounting, 24V DC Coil Volt, 3NO/1NC, 10 A (MPN 3RH21312FB40). Key specifications — Brand: SIEMENS.
SIEMENS IEC Control Relay: DIN-Rail & Surface Relay Mounting, 120V AC Coil Volt, 4NO/4NC, 10 A (MPN 3RH22444AK60). Key specifications — Brand: SIEMENS.
Siemens
SIEMENS IEC Control Relay: DIN-Rail & Surface Relay Mounting, 120V AC Coil Volt, 4NO/4NC, 10 A (MPN 3RH22444AK60). Key specifications — Brand: SIEMENS.
SIEMENS IEC Control Relay: DIN-Rail & Surface Relay Mounting, 250V DC Coil Volt, 3NO/1NC, 10 A (MPN 3RH21311BM40). Key specifications — Brand: SIEMENS.
Siemens
SIEMENS IEC Control Relay: DIN-Rail & Surface Relay Mounting, 250V DC Coil Volt, 3NO/1NC, 10 A (MPN 3RH21311BM40). Key specifications — Brand: SIEMENS.
SIEMENS IEC Control Relay: DIN-Rail & Surface Relay Mounting, 24V DC Coil Volt, 4NO, 10 A (MPN 3RH21402FB40). Key specifications — Brand: SIEMENS.
Siemens
SIEMENS IEC Control Relay: DIN-Rail & Surface Relay Mounting, 24V DC Coil Volt, 4NO, 10 A (MPN 3RH21402FB40). Key specifications — Brand: SIEMENS.
SIEMENS IEC Control Relay: DIN-Rail & Surface Relay Mounting, 125V DC Coil Volt, 2NO/2NC, 10 A (MPN 3RH21221BG40). Key specifications — Brand: SIEMENS.
Siemens
SIEMENS IEC Control Relay: DIN-Rail & Surface Relay Mounting, 125V DC Coil Volt, 2NO/2NC, 10 A (MPN 3RH21221BG40). Key specifications — Brand: SIEMENS.
SIEMENS IEC Control Relay: DIN-Rail & Surface Relay Mounting, 24V DC Coil Volt, 4NO, 10 A (MPN 3RH21401BB40). Key specifications — Brand: SIEMENS.
Siemens
SIEMENS IEC Control Relay: DIN-Rail & Surface Relay Mounting, 24V DC Coil Volt, 4NO, 10 A (MPN 3RH21401BB40). Key specifications — Brand: SIEMENS.
SIEMENS IEC Control Relay: DIN-Rail & Surface Relay Mounting, 120V AC Coil Volt, 4NO, 10 A (MPN 3RH21401AK60). Key specifications — Brand: SIEMENS.
Siemens
SIEMENS IEC Control Relay: DIN-Rail & Surface Relay Mounting, 120V AC Coil Volt, 4NO, 10 A (MPN 3RH21401AK60). Key specifications — Brand: SIEMENS.