Supply voltage (V): 24 V
Type of supply voltage U1: DC
Switching voltage: 24 V
Ambient temperature: -10 – 55 °C
Humidity rating: 93 % r. h. at 40 °C

Non-Contact Magnetic Safety Switching: Ensures reliable operation without mechanical wear, using magnetic actuation to detect guard positions with no physical contact required.
Robust IP67 Housing for Harsh Environments: Sealed to IP67, this switch is ideal for dusty, wet, or industrial environments, providing long-term durability in challenging operating conditions.
Compact 8mm Design for Tight Spaces: Its slim, low-profile form factor makes it perfect for installation in confined areas without sacrificing reliability or safety.
Dual Channel Redundancy (2 NO Contacts): Equipped with 2 normally open (NO) safety outputs to support fail-safe operation in safety circuits, conforming to EN ISO 13849-1 standards.

The Pilz PSEN 1.1p-20/PSEN 1.1-20/8mm (Part No. 504220) is a magnetically actuated, non-contact safety switch designed for the monitoring of safety gates, hatches, or movable guards in industrial automation systems. Engineered for precision, reliability, and durability, this switch helps ensure that machine access points remain secure while allowing seamless integration into complex safety architectures.

Unlike traditional mechanical switches that wear over time due to repeated contact, the PSEN 1.1p-20 employs magnetic actuation—eliminating physical contact and significantly extending the lifecycle of the device. This makes it ideal for applications where maintenance downtime must be minimized and consistent safety performance is essential.

With a slim 8mm profile, the switch is particularly well-suited for compact installations or where space is limited. Its small size doesn’t compromise safety, however; it features 2 normally open contacts to provide dual-channel redundancy, which meets performance level requirements per EN ISO 13849-1 and can be used in conjunction with safety relays or controllers.

The device is rated IP67, making it highly resistant to dust and water ingress. This ensures dependable operation in environments exposed to washdowns, humidity, or general contamination, such as in food processing, packaging lines, and automated production facilities.

Installation is straightforward with its M8 connection, allowing plug-and-play compatibility with a variety of automation systems. When paired with a corresponding actuator, the switch provides safe and accurate detection of door or guard positions—triggering machine stop conditions if the guard is opened during operation.

Whether you’re upgrading an existing machine or designing a new safety solution from the ground up, the Pilz 504220 magnetic safety switch is a compact, rugged, and standards-compliant option that offers both performance and peace of mind.