The Siemens 3RH2422-1AP00 is a compact SIRIUS 3RH2 latched contactor relay designed for energy-efficient, reliable control in industrial automation systems. Featuring a Size S00 frame, 2 Normally Open (2NO) + 2 Normally Closed (2NC) contacts, and a 230V AC (50/60 Hz) operating coil, this relay mechanically latches its switching position. Because it retains its state after the control pulse is removed, it eliminates the need for continuous coil energization, drastically reducing power consumption and heat inside control panels.
Mechanical Latching Function: Retains its contact state even during power loss or signal removal, eliminating continuous coil power consumption.
2NO + 2NC Auxiliary Contacts: Provides 4-pole auxiliary contact logic for interlocking, status feedback, and complex automation sequences.
230V AC Control Coil (50/60 Hz): Designed for direct integration with standard AC control transformers and automation lines.
Compact Size S00 Frame: Offers high packing density, saving critical space on DIN rails and panel mounting plates.
Dual Mounting Options: Supports quick snap-on mounting on standard 35mm DIN rail or direct screw mounting.
Secure Screw Terminals: Vibration-resistant screw connection technology guarantees safe, maintenance-free wiring.
High Electrical Reliability: Manufactured to Siemens SIRIUS standards, offering long mechanical service life and reliable signal switching under tough industrial conditions.
Energy Management & Power Conservation Circuits
Industrial Lighting Control & Building Automation
Memory/State-Retention Circuits & Interlocking Systems
Process Control, PLC Input/Output Interfacing & Machine Tools
OEM Control Panels & Motor Control Centers (MCC)
Q1: What makes a latched contactor relay like the Siemens 3RH2422-1AP00 different from a standard relay?
A: A latched contactor relay maintains its switching position mechanically after receiving a control signal, so it does not require a continuous electrical signal to stay energized. This saves energy and prevents unexpected reset on control power dropouts.
Q2: What is the coil voltage and contact configuration for this model?
A: It features a 230V AC operating coil (50/60 Hz) and an auxiliary contact arrangement of 2NO (Normally Open) + 2NC (Normally Closed).
Q3: How is the Siemens 3RH2422-1AP00 mounted inside a control cabinet?
A: It is designed for versatile panel installation, supporting both 35mm DIN-rail mounting and direct screw fixing.
Q4: Can additional auxiliary contacts or surge suppressors be mounted on this relay?
A: Yes, as part of the modular Siemens SIRIUS Size S00 system, compatible snap-on auxiliary contact blocks and surge suppressors can be added if needed.
Siemens 3RH2911 Series Auxiliary Contact Blocks: For extending control logic with additional NO/NC contact poles.
Siemens 3RT201 Series Power Contactors (Size S00): Matching Size S00 motor switching contactors for uniform panel layouts.
Siemens 3RT2916 Surge Suppressors: Varistors or RC elements to protect sensitive upstream PLC outputs from voltage spikes.
| Parameter | Specification |
|---|---|
| Manufacturer | Siemens |
| Part Number | 3RH2422-1AP00 |
| Product Series | SIRIUS 3RH2 |
| Product Type | Latched Contactor Relay |
| Frame Size | S00 |
| Contact Configuration | 2 NO + 2 NC |
| Coil Type | AC Coil |
| Coil Voltage | 230 V AC, 50/60 Hz |
| Connection Type | Screw Terminals |
| Mounting | DIN Rail or Screw Mount |
| Rated Insulation Voltage | 690 V |
| Surge Withstand Voltage | 6 kV |
| Front Protection | IP20 |
| Mechanical Service Life | Up to 5 Million Operating Cycles |
| Application | Control, Latching & Auxiliary Switching |
| Standard | IEC 60947 |
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