101182218 Safety Stop Relay SSW301HV-230V

The 101182218 Safety Stop Relay, model SSW301HV-230V, is a forced-guided relay module designed for emergency stop circuits, safety gates, and two-hand control systems in industrial machinery. Operating on 230V AC, this safety relay monitors the status of external safety devices and provides redundant safety outputs that comply with the highest performance levels required by international machinery safety standards.

Functional Description

The SSW301HV-230V accepts dual-channel inputs from emergency stop buttons, safety limit switches, or light curtains. When both input channels close simultaneously, the relay energizes its internal solenoid, closing the two forced-guided NO safety contacts. If either input channel opens, the relay de-energizes, opening the safety contacts within the specified response time. The internal positively driven (forced-guided) contact mechanism ensures that any welded contact is detected and prevents the opposite contact from closing, satisfying the requirements of EN 60947-5-1. A status LED indicates power, input status, and output activation.

Wiring and Configuration

The relay accepts single-channel or dual-channel wiring with or without cross-circuit detection. For dual-channel with cross-circuit monitoring (also known as dual-channel equivalent or complementary), the relay checks for shorts between the two input wires and between each input and supply. Terminal designations include S11/S12 for channel 1, and S21/S22 for channel 2. A manual or automatic reset mode is selectable via a jumper between terminals Y1 and Y2. In manual reset mode, a push button connected to Y1–Y2 must be pressed after the inputs close to re-energize the safety outputs.

Standards and Compliance

The 101182218 safety relay is certified by TÜV Rheinland and meets EN 60204-1 (electrical equipment of machines), EN ISO 13849-1 (safety of machinery – safety-related parts of control systems), and IEC 61508 (functional safety). It also complies with UL 508 for industrial control equipment and carries CE marking. The device is suitable for applications up to category 4 (ISO 13849-1) when wired in dual-channel configuration with cross-circuit detection.

Mechanical and Environmental Data

Housed in a compact 22.5mm width DIN rail case (EN 60715), the relay requires minimal panel space. The housing is made of polyamide 6.6 with V-0 flammability rating. Screw terminals accept wire sizes 0.2–2.5mm² (24–12 AWG). The relay withstands vibration of 10–55 Hz at 0.35mm amplitude and shock of 10g for 11ms. MTBF (mean time between failures) exceeds 100,000 hours. Electrical endurance is 100,000 operations at rated load, while mechanical endurance exceeds 10 million operations.

Applications

The SSW301HV-230V is used in packaging machinery, conveyor systems, robotic cells, printing presses, and woodworking equipment. It provides the safety stop function for emergency stops, door interlocks, and two-hand control systems. Its 230V AC coil allows direct operation from common industrial control transformer secondaries without additional power supplies.

Diagnostic Capabilities

LED indicators on the front panel show: green for supply voltage present, yellow for input status (both channels closed), and red for output active. The relay also includes a removable terminal block for easy replacement without rewiring. An optional plug-in diagnostic module can display fault codes for cross-circuits, channel imbalance, or reset circuit errors.

Installation Notes

Mount the relay on a 35mm DIN rail inside a control cabinet with IP54 or better rating. Ensure that external safety devices have direct opening action (positive opening) per IEC 60947-5-1. Use separate cable entries for input and output wiring to avoid noise coupling. The relay does not require an external fuse for short-circuit protection but should be protected by a 6A circuit breaker or 10A gG fuse on the supply side.

Conclusion

The 101182218 SSW301HV-230V safety stop relay delivers reliable, standards-compliant safety switching for industrial machinery. Its forced-guided contact design, dual-channel monitoring, and compact form factor make it a preferred component for machine builders and system integrators requiring PL e / SIL 3 safety performance.