The ifm electronic G1502S and G1503S are multifunctional safety relays designed for monitoring tasks in safety applications across manufacturing and other industrial sectors. As a redundant system tested and certified by TÜV-Nord, they provide a high level of safety integrity for a wide range of applications, including fail-safe sensors/switches, clocked fail-safe sensors, two-hand controls, and E-STOP systems. Both models offer self-monitoring and short-circuit-proof inputs and outputs, ensuring robust performance in demanding industrial environments.

These safety relays are engineered to meet the latest global safety standards, including SIL 3 (IEC 61508), PL e (ISO 13849-1), and EN 574 Type IIIC for two-hand control devices. The G1502S model features relay outputs with a configurable switch-off delay, while the G1503S model provides semiconductor outputs in a more compact housing.

Key Features & Advantages

Two-Hand Control to EN 574 Type IIIC: Both the G1502S and G1503S allow operation as two-hand control devices in compliance with EN 574 and EN ISO 13851, Type IIIC. They can be used with either electronic sensors or mechanical switches, offering flexibility for various machine guarding applications.

E-STOP with Cross-Fault Monitoring: The safety relays support emergency stop functions with cross-fault monitoring and optional simultaneity monitoring. This ensures that short circuits between input channels are detected, preventing unsafe conditions. The monitored or automatic start function is selectable, adapting to different machine startup requirements.

Flexible Input and Output Configuration: The G1502S features several multifunctional self-detecting and self-monitoring inputs and short-circuit-proof outputs. Users can set simultaneity monitoring on inputs, along with the functions "monitored" or "automatic start", and two delayed contacts. The G1503S offers two PNP safe outputs (semiconductor) and one safe output, providing a redundant system for increased safety.

Configurable Switch-Off Delay (G1502S): The G1502S includes safety outputs with an adjustable switch-off delay ranging from 0.25 to 10 seconds. This feature is ideal for applications requiring controlled stopping or time-delayed safety responses. The delay setting cannot be tampered with without tripping the relay, ensuring security and reliability.

Wide Application Compatibility: These relays can be used with a variety of electro-sensitive protective equipment (ESPE), eliminating the need for specialized relays for light curtains, E-stops, or two-hand controls. They work seamlessly with ifm's entire range of fail-safe inductive sensors, including GM701S (2 PNP outputs) and GM504S (clocked fail-safe sensors).

Comprehensive Safety Certifications: Both models conform to the highest safety standards: SIL 3 (IEC 61508), Category 4 PL e (ISO 13849-1), and EN 574 Type IIIC. The G1502S also meets EN ISO 13849-1: 2008+AC2009 and is certified by TÜV-Nord. The safe state for the G1502S is when the output contacts (13-14, 23-24, 33-34, 43-44, 67-68, 77-78) are open and the output contact (51-52) is closed.

Robust Electrical Design (G1502S): The G1502S operates on 24 V DC (19.2 to 30 V DC, including 5% residual ripple). It provides 3 safety-related normally open (NO) contacts (floating) without delay, 2 safety-related NO contacts (floating) with switch-off delay, and 2 non safety-related signal outputs without delay (1 x NO, 1 x NC, floating contacts) plus 1 positive-switching signal output with delay.

Compact and DIN Rail Mountable: Both relays are designed for 35mm DIN rail mounting (EN 60715), simplifying installation in control cabinets. The G1502S measures 114 × 50 × 105 mm, while the G1503S offers a more compact form factor at 100 × 25 × 105 mm. The screw terminal connections (Phoenix Contact MSTBO) provide secure and reliable wiring.

Model Comparison

• G1502S: Relay outputs with 7PST-6NO/1NC (6 Form A, 1 Form B) contact configuration, 6A contact rating, and adjustable switch-off delay (0.25-10s). Features 3 safety NO contacts (without delay) and 2 safety NO contacts (with delay). Housing dimensions: 114 × 50 × 105 mm.
• G1503S: Semiconductor (PNP) outputs with 2 safe PNP outputs. Features DPDT (2 Form C) contact configuration. More compact housing: 100 × 25 × 105 mm. Ideal for applications requiring fast switching and high cycle life.

Technical Specifications

• Manufacturer: ifm electronic gmbh
• Product Type: Safety Relay / Two-Hand Control Device
• Standards Compliance: EN 574 Type IIIC, EN ISO 13851, IEC 61508 (SIL 3), ISO 13849-1 (Category 4, PL e)
• Operating Voltage: 24 V DC (19.2...30 V DC, including 5% residual ripple)
• Mounting Type: DIN Rail (35mm according to EN 60715)
• Termination Style: Screw Terminal (Phoenix Contact MSTBO)
• Operating Temperature: -25°C to +55°C
• Protection Rating: IP20
• Certification: TÜV-Nord certified, CE

Applications

• Two-Hand Control Systems: Machine guarding for presses, stamping machines, and hydraulic equipment requiring EN 574 Type IIIC compliance
• E-STOP Monitoring: Emergency stop circuits with cross-fault detection for industrial machinery and production lines
• Fail-Safe Sensor Integration: Connection of electronic fail-safe sensors (e.g., GM701S, GM504S) and mechanical safety switches
• Electro-Sensitive Protective Equipment (ESPE): Light curtains and safety light grids requiring safety relay interfaces
• Manufacturing Automation: Safety monitoring for robotic workcells, assembly lines, and packaging equipment