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SIEMENS 3RU1146-4JB0 IEC Grade Thermal Overload Relay

Product Description

The SIEMENS 3RU1146-4JB0 is a Class 10 thermal overload relay from the SIRIUS 3RU11 series, designed for protecting three-phase and single-phase AC/DC motors against overcurrent, phase loss, and overheating. It features manual/auto reset options, temperature-compensated tripping, and direct mounting compatibility with 3RT10/3RT1 contactors, making it ideal for industrial motor control applications .

Key Features & Advantages

Precise Motor Protection
- Current range: 45–63A, suitable for motors up to 30 kW at 400V AC .
- Class 10 tripping for fast response to overloads (typical for motor protection) .
- Temperature compensation: Stable performance across -20°C to +60°C .
Robust Industrial Design
- Screw terminals for secure wiring (supports 2.5–6 mm² conductors) .
- IP20 protection against dust and accidental contact .
- Dual auxiliary contacts: 1 NO + 1 NC for fault signaling and control circuit integration .
Flexible Installation
- Direct mounting on 3RT10/3RT1 contactors or standalone via adapter kits .
- Compact dimensions: 70 × 120 × 140 mm (W×H×D) .
Safety & Compliance
- Certifications: UL, CSA, IEC 60947-4-1, VDE 0660 .
- Short-circuit protection: Requires external fuses or circuit breakers .

Technical Specifications

Parameter	Specification
Rated Current	45–63 A
Motor Power (400V AC)	30 kW
Trip Class	10
Auxiliary Contacts	1 NO + 1 NC
Operating Temp.	-20°C to +60°C (compensated)
Mounting	DIN rail or direct to contactor
Standards	IEC 60947, UL, CSA