Technical Overview

Transverse auxiliary switch for SIRIUS 3RV2 circuit breakers, 1NO+1NC, IP20. Ideal for signaling and interlocking.

Key Features

Transverse mounting orientation allows compact side-by-side installation on 3RV2 circuit breakers.
Finger-safe IP20 protection on the front face per IEC 60529 reduces accidental contact risk.
Accepts two conductors per terminal (2x 0.5-1.5 mm² or 2x 0.75-2.5 mm²) for flexible wiring.
Plug-in fixing allows tool-free installation directly onto the 3RV2 circuit breaker body.
Compact dimensions (45 x 12 x 17 mm) for integration in densely packed switchgear assemblies.
Screw terminal connection ensures secure and service-friendly wiring in the control circuit.
Part of the SIRIUS modular system for easy expansion and system-compliant integration.

Technical Specification Matrix

Parameter	Value
Contact Arrangement	1 NO + 1 NC instantaneous
Compatible Circuit Breaker Sizes	S00, S0, S2, S3
Rated Insulation Voltage	300 V
Surge Voltage Resistance	4 kV
Operational Current AC-12 (24 V)	2.5 A
Operational Current AC-12 (230 V)	2.5 A
Operational Current AC-15 (24 V)	2 A
Operational Current AC-15 (230 V)	0.5 A
Operational Current DC-13 (24 V)	1 A
Operational Current DC-13 (48 V)	0.3 A
Operational Current DC-13 (60 V)	0.15 A
IP Rating (front)	IP20 per IEC 60529, finger-safe
Degree of Pollution	3
Operating Temperature	-20 ... +60 °C
Storage Temperature	-50 ... +80 °C
Mounting Type	Plug-in fixing, transverse design
Terminal Type	Screw-type terminals
Connectable Conductor Cross-sections (Solid/Stranded)	2x (0.5 - 1.5 mm²), 2x (0.75 - 2.5 mm²)
Connectable Conductor Cross-sections (AWG)	2x (20 - 14)
Physical Weight (kg)	0.0175
Dimensions L x W x H (cm)	10.6 x 5 x 5.5

Industrial Applications

1. Motor Status Indication in Industrial Control Panels

The Siemens 3RV2901-1E auxiliary switch accurately signals the ON/OFF or tripped status of a 3RV2 motor circuit breaker to a Programmable Logic Controller (PLC) or human-machine interface (HMI) in industrial control panels.

Problem Solved

Provides essential real-time feedback on motor circuit breaker status, enhancing operational awareness and enabling faster troubleshooting of motor-driven systems. The 300V insulation is suitable for typical industrial control voltages, and IP20 offers basic protection in enclosed panels. Its compact size ensures easy integration into crowded control cabinets.

PLC integrationMotor controlStatus signalingControl panelCircuit breaker statusInstantaneous contactIP20300V insulation

2. Interlocking in Complex Motor Starter Assemblies

This auxiliary switch facilitates electrical interlocking between multiple 3RV2 motor circuit breakers within complex motor starter assemblies, ensuring a specific sequence of operation or preventing simultaneous activation of conflicting motors.

Problem Solved

Ensures safe and sequenced operation of multiple motors by providing reliable interlocking signals between their respective circuit breakers. The screw terminals allow for robust connections in critical safety and control circuits, while its transverse mounting minimizes additional width to the compact motor starter assembly.

Electrical interlockingMotor starterSafety circuitsSequence controlCircuit breaker accessoryScrew terminalTransverse mounting

3. Remote Monitoring of Power Distribution in Small Enclosures

The 3RV2901-1E enables remote indication of 3RV2 circuit breaker states to a central monitoring system, such as a Building Management System (BMS), for compact power distribution units or sub-panels.

Problem Solved

Extends monitoring capabilities for critical power circuits to remote locations, allowing for centralized supervision and proactive maintenance without requiring direct access to the breaker. The low operational current ratings (AC-15 at 0.5A, DC-13 at 0.15A) are suitable for control signals, and its minimal footprint along with tool-free installation are advantageous in space-constrained enclosures.

Remote monitoringPower distributionBuilding Management System (BMS)Circuit breaker statusCompact designPlug-in installationLow current signaling

Siemens SIRIUS 3RV2901-1E Auxiliary Switch Transverse

Siemens SIRIUS 3RV2901-1E Auxiliary Switch Transverse

Technical Overview

Key Features

Technical Specification Matrix

Industrial Applications

1. Motor Status Indication in Industrial Control Panels

2. Interlocking in Complex Motor Starter Assemblies

3. Remote Monitoring of Power Distribution in Small Enclosures