Product Description

The Keyence GS-M51P is a compact safety interlock switch designed for hinged doors in industrial applications. It features a robust locking force of 500N when engaged and approximately 30N when disengaged, ensuring secure door closure. The switch supports cascading up to 20 units, allowing for flexible system configurations. It offers a quick response time, with locking to unlocking in 250 ms and detection to non-detection in 20 ms, plus 2 ms per additional unit in the cascade. The GS-M51P is equipped with two PNP transistor outputs, each capable of handling up to 150 mA, and includes auxiliary outputs for non-safety-related functions. Designed for harsh environments, it boasts an IP65/67 enclosure rating and operates within a temperature range of -20 to 55°C. The switch complies with international safety standards, including EN61508 (SIL3) and IEC61508, making it suitable for applications requiring high safety integrity.​

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Technical Specifications

• Model: GS-M51P
• Type: Standard M12 Connector
• Mounting: For hinged doors
• Locking Force: 500N
• Unlocking Force: Approx. 30N
• Cascading Capability: Up to 20 units
• Operating Distance:
• Sao (OFF → ON): 0.1 mm
• Sar (ON → OFF): 15 mm
• Response Time:
• Lock → Unlock: 250 ms
• Detect → Not Detect: 20 ms + 2 ms × (number of cascaded units - 1)
• Not Detect → Detect: 300 ms + 25 ms × (number of cascaded units - 1)
• Control Outputs (OSSD):
• Type: PNP Transistor x 2
• Max Load Current: 150 mA
• Residual Voltage (ON): Max. 2.5 V (5 m cable), Max. 3.5 V (31 m cable)
• OFF State Voltage: Max. 2.0 V (5 m cable), Max. 3.0 V (31 m cable)
• Leakage Current: Max. 0.5 mA
• Max Capacitive Load: 0.8 µF
• Load Wiring Resistance: Max. 2.5 Ω
• Auxiliary Output (Non-safety):
• Type: Transistor
• Max Load Current: 50 mA
• Residual Voltage (ON): Max. 2.5 V (5 m cable), Max. 3.5 V (31 m cable)
• External Inputs:
• Safety Input: Approx. 1.5 mA × 2
• Reset/EDM Input: Approx. 5 mA (Advanced function type only)
• Lock Control Input: Approx. 2.5 mA
• OSSD Operation Switching Input: Approx. 2.5 mA (Advanced function type only)
• Power Supply:
• Voltage: 24 V DC ±20% (Ripple P-P 10% or less, Class 2)
• Power Consumption: 5 W
• Environmental Resistance:
• Enclosure Rating: IP65/67 (IEC60529)
• Operating Ambient Temperature: -20 to 55°C (No freezing)
• Operating Relative Humidity: 5% to 95% RH
• Storage Temperature: -25 to 70°C (No freezing)
• Storage Relative Humidity: 5% to 95% RH
• Mechanical Durability:
• Vibration Resistance: 10 to 55 Hz, Double amplitude 2.0 mm, 5 minutes in each of the X, Y, and Z directions (IEC 60947-5-3)
• Shock Resistance: 30 G in X, Y, Z directions, 6 times each axis (IEC 60947-5-3)
• Materials:
• Main Unit: PBT, PET/PAR, TPC, PC, Nickel-plated steel
• Actuator: PBT, SUS304, Nickel-plated steel
• Mounting Bracket: Aluminum (Plate and screw: Steel)
• Weight:
• Main Unit: Approx. 250 g
• Actuator: Approx. 160 g​