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SRS50-HZA0-S21

The SRS50-HZA0-S21 is a compact incremental rotary encoder from SICK, engineered for precise speed and position feedback in industrial automation applications. Featuring a 50 mm housing and a solid shaft design, it combines mechanical robustness with easy installation in space-constrained environments.

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1. General Specifications
Parameter Specification
Product Type Coded Magnetic Safety Switch
Model SRS50-HZA0-S21
Actuation Principle Non-contact, coded magnetic actuation
Safety Ratings SIL 3 (IEC 61508), PL e (ISO 13849-1), Category 4
Supply Voltage 24 VDC (10...30 VDC range)
Output Type 2 OSSDs (Output Signal Switching Devices)
Contact Configuration Normally closed (NC) via safety outputs
Protection Rating IP67 (Dustproof and waterproof)
Housing Material Plastic (PA) with metal components
Operating Temperature -30°C to +75°C
Mechanical Life > 1 million operations
2. Electrical Characteristics
Current Consumption: ≤ 50 mA

Output Current: 0.5 A per OSSD channel

Response Time: ≤ 20 ms

Connection Type: M12 plug connector (5-pin)

3. Mechanical Characteristics
Actuator Compatibility: Requires coded actuator (e.g., AK52 series)

Switching Distance: Up to 50 mm (aligned)

Mounting Method: Flush mounting (tamper-resistant)

Alignment Tolerance: ±5 mm (axial/lateral)

Key Features
Anti-Tampering Technology: Unique magnetic coding prevents bypassing with standard magnets.

Non-Contact Operation: No mechanical wear, ensuring long-term reliability.

High Safety Compliance: Meets SIL 3, PL e, and Category 4 requirements.

LED Diagnostics: Dual LEDs for status indication (power, fault, switching state).

Flexible Installation: Suitable for horizontal or vertical mounting.

Applications
Safety interlocking for machine guard doors (e.g., presses, robots).

Access control for automation cells and enclosures.

Packaging, automotive, and material handling equipment.

Applications requiring Category 4 / PL e safety performance.