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SRB-E-204ST - Emergency Stop Dual-Contact Relay - SS IP65 SIL2 Industrial Safety
| MOQ: | 1 |
| Price: | USD 100-10000/Piece |
| Standard Packaging: | 50*50*50mm |
| Delivery Period: | 3-7 |
| Payment Method: | T/T |
| Supply Capacity: | 1/piece in stock |
1. Product Overview
The Schmersal SRB-E-204ST is a compact safety relay designed for reliable emergency stop and safety gate monitoring in industrial automation. Featuring a stainless steel housing (IP67 rated), this DIN-rail mountable device meets ISO 13849-1 PL e (Category 4) and IEC 62061 SIL 3 safety standards. Its dual-channel architecture monitors safety devices with force-guided contacts that guarantee safe-state switching during internal faults. Operating at 24V DC within an ambient temperature range of -25°C to +60°C, the relay withstands harsh conditions including exposure to oils, coolants, and vibrations up to 30g acceleration. The integrated multicolor LED diagnostics provide instant visual status feedback for power, fault detection, and output states. With a slim 22.5mm width, it optimizes control panel space while delivering robust protection for machinery in automotive, packaging, and material handling applications.
2. Key Technical Parameters
This safety relay operates at 24V DC ±10% (19.2-28.8V) with dual monitored inputs (S11/S12) and three safety outputs: two semiconductor outputs (0.5A) plus one relay contact (5A at 250V AC). Its safety certifications include UL 508, CE, and UKCA compliance. The device features a rapid ≤100ms response time and incorporates automatic startup testing to validate contact separation. Electrical isolation of 4kV between input and output circuits prevents cross-circuit failures. Constructed with electropolished stainless steel (AISI 304), it achieves IP67 protection against dust and high-pressure water jets. Installation uses standard EN 60715-compliant 35mm DIN rail mounting with spring-cage terminals accommodating 0.25–2.5mm² wires. The relay weighs 180g and maintains functional safety for over 100,000 mechanical operations under typical industrial conditions.
3. Primary Applications
This safety relay is engineered for critical machine safety functions across multiple industries. In automotive manufacturing, it monitors press line emergency stops and robotic cell access gates. Packaging machinery utilizes it for two-hand control systems and conveyor guarding. Material handling systems deploy it for safety light curtain monitoring around AGV paths. For plastic injection molding, it secures mold area access doors while integrating with hydraulic lock monitoring. Pharmaceutical production benefits from its washdown-resistant housing in cleanroom guarding applications. Metal fabrication equipment like press brakes and laser cutters rely on it for E-stop circuit integrity. Automated warehouses implement it for palletizer guard door interlocks, while food processing lines leverage its corrosion resistance for CIP-washdown zones. Its compact design makes it particularly valuable in space-constrained control cabinets across these applications.
4. Functional Advantages
The SRB-E-204ST delivers significant operational benefits through advanced safety engineering. Its dual-channel monitoring provides redundant fault detection with cross-wire break recognition. Force-guided contacts (EN 50205 certified) mechanically guarantee ≥0.5mm separation during welding faults. The multicolor LED status indication simplifies troubleshooting: green (power/operation), yellow (device ready), and red (fault condition). Configuration flexibility comes via jumpers for manual or automatic reset selection with optional external reset button support. A startup test function automatically validates contact separation integrity during power-up. The stainless steel housing offers exceptional corrosion resistance in humid or chemical-exposed environments. Installation efficiency is enhanced through tool-free spring terminals and DIN rail snap mounting. The relay provides cross-fault detection between monitored channels, ensuring safety integrity remains uncompromised. Additionally, it offers semiconductor auxiliary outputs for PLC-based diagnostic integration without additional components.
5. Safety Operation & Diagnostics
Operational safety is ensured through a sophisticated dual-monitoring sequence:
- Input Monitoring: Continuously cross-checks S11/S12 signals for discrepancies beyond 5ms, detecting faults like contact welding or wire breaks
- Startup Validation: Automatically tests contact separation (>0.5mm gap) upon power restoration before enabling outputs
- Fault Response: Forces safety outputs open within 100ms upon detecting input channel mismatches
- Reset Control: Requires manual intervention (local or external button) before restarting after safety triggers
- Diagnostic Hierarchy:
- Green LED: Power present + inputs valid
- Yellow LED: Reset required after fault clearance
- Red LED: Active fault condition
- Flashing Yellow: Startup test in progress
- Safety Output Configuration:
- Semiconductor Outputs (13-14/23-24): Enable machine operation when inputs validate
- Relay Contact (41-42): Provides mechanical NO signal for remote diagnostics
The module maintains safety integrity even during undervoltage conditions below 19V DC through automatic lockout. Relay performance metrics exceed 100,000 mechanical cycles while maintaining SIL 3 safety margins.
| Parameter | Specification/Value |
|---|---|
| Product Type | Emergency Stop Switch (Twist Release) |
| Series | SRB-E Standard Series |
| Actuator Design | Ø 40 mm Mushroom Head Red (RAL 3000) with yellow base ring (ISO 13850 compliant) |
| Contact Configuration | 2 NC (Safety) + 1 NC/1 NO (Auxiliary) • Safety contacts: 13-14, 21-22 • Auxiliary: 31-32 (NC), 41-42 (NO) |
| Safety Integrity | Category 4 / PL e (EN ISO 13849-1) Stop Category 0 (IEC 60204-1) |
| Protection Rating | IP65 (Frontal) IP54 (Rear housing) |
| Electrical Ratings | • Voltage: 24–240V AC/DC • Current: 10A (AC-15), 6A (DC-13) • Switching Capacity: 3000 VA / 180 W |
| Mechanical Life | ≥ 1,000,000 cycles (No load) |
| Electrical Life | 100,000 cycles (At rated load) |
| Actuation Force | ≥ 80 N (ISO 13850 compliant) |
| Reset Mechanism | Key-operated Twist Release Anti-rotation collar |
| Housing Material | Glass-fiber reinforced PA 6.6 Halogen-free, UV-stabilized (RAL 7035 Grey) |
| Contact Material | AgNi (Silver Nickel) with self-cleaning design |
| Terminal Connection | Screw Clamp Terminals Max. wire: 2.5 mm² Torque: 0.5–0.6 Nm |
| Operating Environment | Temp: -25°C to +70°C Humidity: ≤ 93% RH (non-condensing) |
| Impact Resistance | IK08 (50J impact protection per EN 62262) |
| Mounting | Panel Cutout: Ø 22.5 mm Depth: 70 mm |
| Safety Features | • Positive Opening contacts (EN 60947-5-1) • Mechanically linked dual-channel NC |
| Global Certifications | CE, UL 508, CSA, TÜV, EAC, CCC, KC |
| Compliance Standards | EN/IEC 60947-5-1, EN ISO 13850, ANSI B11.19, IEC 60204-1 |
| Vibration Resistance | 10–55 Hz (0.35mm amplitude) per EN 60068-2-6 |
Packaging & Shipping
Company Information
Xiamen ZhiCheng Automation Technology Co., Ltdit is a leading global supplier of control system components. We specialize in control systems and drives.
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