Interlock Sensor for Safety Interlock Systems

Product Specifications

Technical details and manufacturing context for Interlock Sensor

Definition

The Interlock Sensor is a component used in machinery and equipment manufacturing, specifically within safety interlock and viewport systems. Its primary function is to monitor whether protective guards, doors, or access panels are properly closed and secured. By detecting the physical position of these safety barriers, the sensor ensures that machinery cannot operate when they are open, thereby preventing operator exposure to hazardous moving parts, high temperatures, or other dangers. The sensor operates through various detection methods, including magnetic, mechanical, proximity, or RFID technologies. When a guard is open, the sensor sends a signal to the machine's control system to prevent startup or initiate an immediate shutdown. Conversely, when the guard is properly closed, the sensor allows normal operation. This product is designed for industrial environments and is available with a stainless steel housing, polycarbonate lens, copper wiring, and magnetic or electronic sensing elements. Key parameters include a rated operating voltage of 24 V DC ±10%, a switching current of 0.1–0.5 A (max resistive load), an IP67 protection class, an operating temperature range of -25 to 70 °C, a mechanical life of 1,000,000 cycles, an electrical life of 500,000 cycles, a repeat accuracy of ±0.05 mm, a housing material of PBT-GF30 (flame retardant V-0), cable lengths of 2–10 m (PVC or PUR jacket), and a weight of 0.15–0.25 kg (without cable). These values are reference ranges and must be verified for the specific model and application. The sensor is referenced against standards such as IEC 60947-5-2, IEC 60529, IEC 60068-2-1/2, and UL 94. Always confirm model-specific values and standards with the legal manufacturer or supplier before procurement.

Working Principle

The Interlock Sensor detects the physical position of a guard or door using methods such as magnetic, mechanical, proximity, or RFID sensing. When the guard is open, the sensor sends a signal to the machine's control system to prevent startup or initiate immediate shutdown. When the guard is properly closed, the sensor allows normal operation. The sensor's output is typically a binary signal that is interpreted by the safety control circuit. The detection mechanism is designed to be reliable and repeatable, with a repeat accuracy of ±0.05 mm. The sensor is housed in a durable stainless steel or PBT-GF30 housing, and its sensing elements are protected by a polycarbonate lens. The sensor operates within a specified voltage and temperature range, and its performance is verified against relevant IEC standards.

Common Materials

Stainless Steel Housing, Polycarbonate Lens, Copper Wiring, Magnetic/Electronic Sensing Elements

Technical Parameters

Parameter	Typical range	Notes & selection driver
Rated Operating Voltage	24 ±10% V DC	Standard industrial DC supplyIEC 60947-5-2
Switching Current	0.1–0.5 A	Max resistive loadIEC 60947-5-2
Protection Class	IP67	Dust-tight and protected against immersionIEC 60529
Operating Temperature	-25–70 °C	Extended range available on requestIEC 60068-2-1/2
Mechanical Life	1,000,000 cycles	Under rated loadIEC 60947-5-2
Electrical Life	500,000 cycles	At rated voltage and currentIEC 60947-5-2
Repeat Accuracy	±0.05 mm	Actuator position repeatabilityIEC 60947-5-2
Housing Material	PBT-GF30	Flame retardant V-0UL 94
Cable Length	2–10 m	PVC or PUR jacket
Weight	0.15–0.25 kg	Without cable

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

Sensing Head
Detects the presence/position of the guard through magnetic, mechanical, or proximity methods

Material: Stainless Steel or Polycarbonate
Actuator/Target Part
Mounted on the guard/door to interact with the sensing head

Material: Magnetic Material or Metal
Housing Part
Protects internal electronics from environmental factors and physical damage

Material: Stainless Steel or Engineering Plastic
Wiring Connection Part
Electrical interface for power supply and signal output to control system

Material: Copper Conductors with Insulation
Polycarbonate Lens
Covers the sensing face; it passes the field or beam while taking the knocks.

Applied To / Applications

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

Safety Interlock & Viewport

View system integration details

Manufacturers of Interlock Sensor

Manufacturer profiles associated with Interlock Sensor.

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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 primary function of an interlock sensor?

The primary function is to detect whether a protective guard, door, or access panel is closed and secured. If the guard is open, the sensor sends a signal to the machine control system to prevent startup or initiate shutdown, ensuring operator safety.

What detection methods does the interlock sensor use?

The sensor can use magnetic, mechanical, proximity, or RFID methods to detect the position of the guard. The specific method depends on the model and application requirements.

What are the typical electrical specifications?

Typical specifications include a rated operating voltage of 24 V DC ±10%, a switching current of 0.1–0.5 A (max resistive load), and an electrical life of 500,000 cycles. These values are reference ranges and must be confirmed for the specific model.

What standards apply to this interlock sensor?

The sensor is referenced against standards such as IEC 60947-5-2 for switching devices, IEC 60529 for protection class, IEC 60068-2-1/2 for temperature, and UL 94 for flame retardancy. Always verify compliance with the manufacturer.

Data Basis

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

Preliminary Technical Classification

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pressure:	0 to 1 bar (ambient pressure only)
other spec:	IP67 ingress protection, 10-30V DC supply voltage, 100mA max current
temperature:	-20°C to +85°C

Interlock Sensor

Product Specifications

Applied To / Applications

Industrial Ecosystem & Supply Chain Structure

Application Fit & Sizing Matrix

Reliability & Engineering Risk Analysis

Compliance & Manufacturing Standards