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SIEMENS 3RH1921-1KA11 Auxiliary Contact Block

Product Description

The SIEMENS 3RH1921-1KA11 is an auxiliary contact block designed for 3RT1 series contactors, providing additional switching contacts for control and monitoring circuits in industrial automation systems. It features 1 normally closed (NC) and 1 normally open (NO) contact, making it ideal for status signaling and interlocking applications .

Key Features & Advantages

Versatile Contact Configuration
- 1 NC + 1 NO contacts, supporting 6A (AC) / 0.3–6A (DC) for flexible control applications .
- Screw-type terminals for secure wiring, compatible with 2 x 2.5 mm² cables .
Robust Industrial Design
- Side-mounting on compatible 3RT1 contactors (e.g., S00 size) for space-saving integration .
- IP20 protection against dust and accidental contact .
- Mechanical lifespan: 10 million operations, ensuring long-term reliability .
Easy Installation
- Tool-free snap-on mounting for quick attachment to contactors .
- Compact dimensions: 7.5 × 8.3 × 2.3 cm (L×H×W), weighing 0.05 kg .
Safety & Compliance
- Isolation voltage: 690V, meeting IEC 60947-5-1 standards .
- Certifications: CE, RoHS, and 3C (China) .

Technical Specifications

Parameter	Specification
Contact Configuration	1 NC + 1 NO
Rated Current	6A (AC), 0.3–6A (DC)
Voltage Range	24–230V AC/DC
Terminal Type	Screw terminals
Mounting	Side-mounted (3RT1 contactors)
Operating Temp.	-25°C to +60°C
Dimensions (L×H×W)	7.5 × 8.3 × 2.3 cm
Weight	0.05 kg

Applications

Motor control: Status feedback for contactors in conveyor systems .
HVAC systems: Interlocking for pumps and fans .
Industrial automation: Integration with SIMATIC PLCs for diagnostic signaling .

Installation & Safety Notes

Wiring: Use shielded cables for noise-sensitive applications .
Environment: Avoid condensation and temperatures beyond -25°C to +60°C .
Compatibility: Verify alignment with 3RT1 contactors (S00 size) before installation .