IFM G1501S Safety Relay 24V DC 2NO 6A PL e SIL3 DIN Rail

Overview
The IFM G1501S is a high-performance safety relay (safety switch gear) designed for fail-safe monitoring of safety circuits in industrial automation applications. As a redundant system, this safety relay is suited for fail-safe sensor/switch monitoring (PNP and clocked types), two-hand control (electronic and mechanical switches), and simultaneity monitoring. It meets the requirements of EN ISO 13849-1: 2008 category 4 PL e, SIL 3 (IEC 61508), and type IIIC (EN 574). The relay provides 2 safety-related NO contacts (floating contacts) and 1 signal output (positive switching). Signal output is via potential-free relay contacts, with cross-monitoring and possible simultaneity monitoring. The G1501S enables connection of mechanical safety switches and electronic fail-safe sensors, and serves as a switching device for two-hand control with mechanical or electronic switches. Monitored or automatic start is selectable, providing flexibility for various safety applications.

Key Features

• Original brand new, within warranty period – Factory‑sealed, genuine IFM component with full manufacturer warranty.

• 100% Satisfaction Guarantee – Risk‑free purchase; if you are not completely satisfied, we will replace or refund.

• Certified machine safety – PL e / SIL 3 – Meets EN ISO 13849-1: 2008 category 4 PL e, SIL 3 (IEC 61508), and type IIIC (EN 574) requirements, ensuring the highest levels of safety integrity for critical machine protection applications.

• Redundant system design – Redundant internal architecture provides defined behaviour under fault conditions, ensuring a safe state is maintained when output contacts are open. Tested and certified by TÜV-Nord.

• Versatile application compatibility – Suitable as safety relay for fail-safe sensors/switches with 2 PNP outputs, clocked fail-safe sensors, mechanical switches, and 2-channel fail-safe sensors/switches with contact output.

• Cross-monitoring and simultaneity monitoring – Built-in cross-monitoring detects wiring faults between channels, while simultaneity monitoring ensures proper synchronisation of two-hand control inputs for safe operation.

• Monitored or automatic start selectable – Configurable start behaviour (monitored start requiring feedback loop, or automatic start) provides flexibility for different safety circuit architectures and machine reset requirements.

• 2 safety-related NO contacts (floating) + 1 signal output – Two normally open safety contacts (6A, 250V AC / 24V DC) for switching safety loads, plus one positive-switching signal output for status indication back to the PLC.

• 24V DC operation with wide tolerance – Operating voltage 24V DC (19.2…30V DC) including 5% residual ripple; current consumption less than 200mA. Contacts must be protected by fuses with nominal current <3.6A.

• Wide ambient temperature range (-25…55°C) – Operates reliably in ambient temperatures from -25°C to 55°C (inside switch cabinet) with IP20 protection rating, suitable for demanding industrial environments.

• High reliability with PFHd < 2.2E-09 – Probability of dangerous failure per hour (PFHd) is less than 2.2E-09, ensuring long-term safety integrity with a mission time (TM) of ≤ 175,200 hours (~20 years).

Technical Specifications

Applications

• E-stop and safety gate monitoring – Connection of emergency stop pushbuttons and interlock safety switches to safety circuits requiring PL e / SIL 3 performance.

• Fail-safe sensor monitoring (PNP and clocked types) – Safe evaluation of 2-channel PNP fail-safe inductive sensors, light barriers, light curtains (ESPE to EN 61496-1), and laser scanners.

• Two-hand control – Switching device for two-hand control using mechanical or electronic switches, meeting EN 574 type IIIC requirements for operator safety on presses and dangerous machinery.

• Mechanical safety switches – Monitoring of mechanical fail-safe switches with contact outputs, including 2-channel evaluation with simultaneity monitoring.

• Machinery safety circuits – Integration into safety loops for conveyors, packaging machinery, robotics, and automated production lines.

• Hazardous area protection – Safety applications requiring the highest performance level (PL e) and safety integrity level (SIL 3).

Package Includes

• 1 × IFM G1501S safety relay (safety switch gear)

• Phoenix Contact MSTBO Combicon connector with screw terminals (supplied)

• Instruction manual / operating instructions

ℹ️ Mounting accessories for DIN rail included. UL has not evaluated the safety function; certification is for general applications per UL 508.