Contactor Relays (Auxiliary Contactors), 3RH2 (S00) with “Mechanically linked contact elements”, AC Coil$ - 3RH2131-1AP008K

Product Description

Siemens 3RH2131-1AP008K Auxiliary Contactor Relay – 230V AC Control Relay with Mechanically Linked Contact Elements

The Siemens 3RH2131-1AP008K Auxiliary Contactor Relay is a premium industrial switching device designed for control, signaling, interlocking, monitoring, and automation applications. Part of the highly reliable Siemens SIRIUS 3RH2 Series, this auxiliary contactor combines robust performance, compact dimensions, and safety-oriented switching technology to meet the requirements of modern industrial control systems. Equipped with a 230V AC coil, 3 Normally Open (3NO) contacts, 1 Normally Closed (1NC) contact, and mechanically linked contact elements, the 3RH2131-1AP008K is an ideal solution for machine builders, panel manufacturers, OEMs, automation engineers, and industrial maintenance professionals.

One of the key advantages of the Siemens 3RH2131-1AP008K is its mechanically linked contact system. Mechanically linked contacts ensure that normally open and normally closed contacts cannot simultaneously indicate conflicting switching states. This design improves operational safety and reliability, making the relay particularly suitable for interlocking circuits, machine safety functions, status monitoring, and control applications that require accurate contact feedback. The mechanically linked design also supports compliance with safety-related control architectures used in industrial automation systems.

The 3RH2131-1AP008K Auxiliary Contactor Relay features a versatile 3NO + 1NC contact configuration, providing flexibility for a wide range of industrial applications. The three normally open contacts can be used for PLC interfaces, control logic circuits, signaling functions, motor control commands, and automation sequences. The normally closed contact supports fault indication, safety interlocking, monitoring circuits, and shutdown functions. This contact arrangement makes the relay suitable for manufacturing plants, packaging machinery, process control systems, conveyor systems, HVAC installations, water treatment facilities, and industrial automation panels.

Designed in the compact S00 frame size, the Siemens SIRIUS 3RH2131-1AP008K offers excellent space efficiency while maintaining industrial-grade switching performance. The compact footprint allows control panel builders to optimize cabinet layouts without sacrificing functionality. Despite its small size, the relay delivers a rated operational current of 10A AC-15 at 230V, making it suitable for demanding control applications.

The relay operates with a 230V AC, 50/60Hz control coil, making it compatible with industrial AC control systems worldwide. Siemens engineering ensures reliable operation across a wide voltage tolerance range, helping maintain stable switching performance even under varying supply conditions. The coil features a pull-in power of approximately 37 VA and a holding power of 5.7 VA, providing efficient operation and dependable switching characteristics.

The Siemens 3RH2131-1AP008K uses durable screw terminal connections, which are widely preferred in industrial control systems due to their secure conductor retention, vibration resistance, and long-term reliability. Screw terminals simplify installation and maintenance while ensuring stable electrical performance in demanding industrial environments. This proven connection technology makes the relay suitable for both new installations and retrofit projects.

As part of the modular Siemens SIRIUS system, the 3RH2131-1AP008K Auxiliary Contactor supports integration with a variety of Siemens accessories, including auxiliary contact blocks, surge suppressors, and mounting accessories. This modular design philosophy simplifies engineering, reduces spare parts inventory requirements, and enables flexible customization according to specific application needs.

Engineered for long service life, the Siemens 3RH2131-1AP008K provides a mechanical endurance of up to 30 million operating cycles, making it an excellent choice for high-frequency industrial switching applications. The relay also features a rated insulation voltage of 690V, impulse withstand voltage of 6kV, and IP20 protection, ensuring dependable performance in demanding industrial environments. Siemens further specifies positively driven operation according to IEC 60947-5-1, supporting safety-related switching applications.

Industrial professionals rely on the 3RH2131-1AP008K Auxiliary Contactor Relay for machine automation, industrial control panels, process automation, signaling systems, PLC interfaces, safety interlocking circuits, and motor control applications. Its combination of mechanically linked contacts, compact construction, robust electrical performance, and Siemens reliability makes it a preferred choice for modern automation projects.

At SBsmart.in, we supply genuine Siemens industrial automation products trusted by OEMs, electrical contractors, system integrators, control panel builders, and industrial buyers across India. When you choose the Siemens 3RH2131-1AP008K, you receive an authentic Siemens SIRIUS auxiliary contactor engineered for superior performance, long-term reliability, and seamless integration into industrial automation systems.