Safety Relay Core

Product Specifications

Technical details and manufacturing context for Safety Relay Core

Definition

The Safety Relay Core is the essential internal component of a Safety Relay Controller that processes safety-critical signals from devices like emergency stops, light curtains, or safety switches. It implements the logic functions (such as dual-channel monitoring, cross-fault detection, and forced-guided contacts) to ensure fail-safe operation and prevent hazardous machine states. Upon detecting a fault or safety demand, it reliably de-energizes the safety outputs to bring equipment to a safe state. This core is designed for use in safety circuits up to Performance Level e (PL e) and Safety Integrity Level 3 (SIL 3) as per IEC 61508. It features two safety input channels for redundancy, and its safety output contacts are forcibly guided (2 N/O + 1 N/C) to ensure reliable operation. The rated control supply voltage is 24 V DC, with an operating range of 0.85 to 1.1 times the rated voltage. Power consumption is typically 2.5 to 5 W, depending on the output load. The contact rating is 6 A at AC-15, 230 V. The response time from input change to output off is 20 to 50 ms. The core operates within a temperature range of -25°C to +55°C, with derating above 40°C. It has a degree of protection of IP20 and is designed for DIN rail mounting, with dimensions of 100 x 22.5 x 115 mm (H x W x D) and a weight of 150 to 200 g. The terminal type is screw, with a recommended torque of 0.5 to 0.6 Nm. Materials include electrical contacts (e.g., silver alloy), copper windings, ferromagnetic core, and plastic housing. Always verify model-specific values and standards with the legal manufacturer or supplier.

Working Principle

The core continuously monitors the status of its safety input circuits. It employs redundancy and self-checking mechanisms (e.g., monitoring for contact welding, wire breaks, or short circuits). When all monitored conditions are safe (e.g., both channels of a dual-channel input are closed correctly), it energizes its internal safety relays, allowing the controlled safety outputs (like a safety contactor) to remain powered. If an unsafe condition, fault, or discrepancy is detected, it de-energizes these internal relays, breaking the safety output circuit in a fail-safe manner.

Common Materials

Electrical Contacts (e.g., Silver Alloy), Copper Windings, Ferromagnetic Core, Plastic Housing

Technical Parameters

Parameter	Typical range	Notes & selection driver
Rated Control Supply Voltage	24 V DC	Operating range 0.85–1.1 x rated voltageIEC 60947-5-1
Power Consumption	2.5–5 W	Depends on output load
Safety Input Channels	2	Dual-channel for redundancyIEC 61508
Safety Output Contacts	2 N/O + 1 N/C	Forcibly guided contactsIEC 60947-5-1
Contact Rating	6 A	AC-15 at 230 VIEC 60947-5-1
Response Time	20–50 ms	From input change to output offIEC 61508
Safety Integrity Level (SIL)	SIL 3	Suitable for up to PL eIEC 61508
Operating Temperature	-25–55 °C	Derating above 40°CIEC 60947-5-1
Degree of Protection	IP20	For cabinet mountingIEC 60529
Dimensions (H x W x D)	100 x 22.5 x 115 mm	DIN rail mount
Weight	150–200 g	Varies with options
Terminal Type	Screw	Torque 0.5–0.6 NmIEC 60947-7-1

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Components / BOM

Monitoring Circuit
Continuously checks the integrity and state of the safety input channels for faults or stop signals.

Material: Electronic Components (ICs, Resistors, Capacitors)
Forced-Guided Relay Contacts Part
Mechanically linked contacts designed to fail in a predictable, safe state (open) to prevent unsafe output conditions.

Material: Silver Alloy Contacts, Spring Steel
Logic Processor
Executes the safety logic (AND, OR, time delay) based on input states to determine output commands.

Material: Microcontroller or Application-Specific Integrated Circuit (ASIC)

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Safety Relay Core.

Applied To / Applications

This component is essential for the following industrial systems and equipment:

Safety Relay Controller

View system integration details

Manufacturers of Safety Relay Core

Manufacturer profiles associated with Safety Relay Core.

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Compiled and source-reviewed by the CNFX editorial team. Each manufacturer above links to the page on that company's own website where the product is listed, with the date we checked it. How we source and review · Page last updated 6 September 2026

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Frequently Asked Questions

What is the Safety Relay Core?

The Safety Relay Core is the internal component of a safety relay controller that processes safety signals from devices like emergency stops, light curtains, or safety switches. It implements logic functions to ensure fail-safe operation.

What safety integrity level does it support?

According to the listed parameters, it is suitable for up to SIL 3 as per IEC 61508. However, the actual achieved SIL depends on the complete system design and must be verified with the manufacturer.

What are the safety output contacts?

The safety output contacts are forcibly guided, with 2 normally open (N/O) and 1 normally closed (N/C) contacts. This configuration helps detect faults and ensures safe switching.

What is the response time?

The response time from input change to output off is typically 20 to 50 ms, as listed. This is a reference range; actual response time may vary and should be confirmed for the specific model.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records.

Preliminary Technical Classification

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voltage:	24V DC ±20%
temperature:	-20°C to +70°C
response time:	≤ 20ms
safety category:	CAT 4 / SIL 3 per IEC 61508
switching capacity:	8A @ 250V AC, 8A @ 30V DC

Product Specifications

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