Single-position limit switch PEM1G21Z A37-A87Z

Safe and Precise Position Detection in Harsh Conditions

This single-position limit switch, designated PEM1G21Z, is designed for reliable position detection of machines and mechanisms in industrial applications. Its metal housing, shaped as a rectangular prism and protected by powder coating, ensures resistance to mechanical damage and corrosion. Thanks to the IP67 protection rating, the sensor can operate in environments exposed to dust, particulates, and temporary immersion in water, making it an ideal choice for production halls with severe conditions.

The device is equipped with a dome-shaped actuator measuring 74 mm in length and 31.5 mm in width, which responds to lateral pressure on the housing. A key structural feature is the positive opening (forced separation) function. This means that the normally closed (NC) contact opens mechanically under external force, independently of the state of the normally open (NO) contact. This is a fundamental safety feature – even if the NO contact "welds" due to arcing or wear, the separation mechanism will still operate, allowing for safe machine shutdown in case of failure.

Application and Electrical Characteristics

This limit switch features a contact configuration of 1 NO + 1 NC, providing great flexibility in control circuit design. It can serve both as a signaling device (e.g., indicating position reached) and as a safety device (immediate power disconnection).

Current load data indicate versatile application in control systems:

• In AC circuits (AC-15) at 230 V, the device handles currents up to 1.5 A, and at lower voltage 24 V – up to 5 A.
• In DC circuits (DC-13), where electric arcs are harder to extinguish, values are lower: 0.22 A at 125 V and 1.1 A at 24 V.
• Maximum operating voltage is 240 V AC or 250 V DC.

It should be noted that the device does not have built-in safety functions (no safety interface), so it is not directly suitable for safety-category circuits requiring PLd/PLc certification without additional external components. This is a typical limit switch with a "snap-action" switching characteristic.

Installation and Operating Conditions

Device installation is simplified by a pre-assembled electrical connection – the switch is equipped with a connection cable approximately 1 meter long (according to manufacturer data), eliminating the need for additional connections in the distribution box. The housing has two mounting holes with a 20 mm spacing, facilitating secure mounting on rigid machine structures.

The device is designed for operation within a wide ambient temperature range: from -25 °C to +70 °C. Thus, it performs well both in industrial cold storage facilities and in hot production zones. The absence of a visual status indicator means the installer must rely on measurement or observation of machine operation after the control system is activated.

Summarizing key operational features: the device features IP67 protection, a powder-coated metal housing, and a dome-shaped actuator. The contact configuration includes positive opening (1 NO + 1 NC), and the operating temperature range extends from -25 °C to +70 °C. Electrical connection is achieved via a connection cable approximately 1 meter long, with a maximum operating voltage of 240 V AC / 250 V DC. Thanks to its robust metal construction and precise actuator mechanics, this model provides a durable solution for production line automation, safety gates, or continuous transport systems.