
The Pilz PSEN 2.1p-20 (522120) is a non-contact magnetic safety switch from the PSENmag series, designed for monitoring movable guards in industrial safety applications. It features a compact square housing design with reed contact technology, providing 1 normally open and 1 normally closed safety contacts. The device operates via magnetic actuation with an 8 mm switching distance, eliminating mechanical wear and ensuring reliable guard position detection. Suitable for applications requiring high safety categories, it functions in harsh environments with heavy soiling or strict hygiene requirements. The switch is compatible with Pilz electronic safety relays and evaluation devices, ensuring safe machine shutdown when guards are opened. Its IP65/IP67 protection rating makes it suitable for demanding industrial environments including food processing, packaging, and general machine guarding applications.
Item Details
- Brand Name: Pilz
- Manufacturer: Pilz GmbH & Co. KG
- Item Type Name: Magnetic Safety Switch
- Product Family / Series: PSENmag
- Model: PSEN 2.1p-20
- Part Number: 522120
- Gtin: 4046548026764
Product Specifications
- switching_distance: 8 mm
- rated_voltage: 24 V DC
- contact_configuration: 1 NO + 1 NC (reed contacts)
- rated_current: 0.01 A
- connection_type: 4-pin M8 male connector
- housing_shape: Square
- housing_material: PBT
- protection_rating: IP65, IP67
- operating_temperature_range: -25 to +70 °C
- vibration_resistance: 10-55 Hz, 1.00 mm amplitude
- shock_resistance: 30 g, 11 ms
- color: Yellow
Additional Details
- Certifications / Approvals: UL, cUL, ATEX
- Connection Method: Series connection for electronic relays
- Actuator Included: No (sold separately)
- Application: Guard monitoring, non-contact safety switching
Measurements
- Weight: 35 g
- Dimensions: 26 mm (W) x 42.8 mm (H) x 13 mm (D)
All PLC Direct products come with a 1-year warranty. The warranty is issued by PLC Direct. Warranty coverage commences at the date of purchase. The warranty is for mechanical defects or failures not caused by human factors including but not limited to (a) incorrect installation, (b) operating the unit in sub-optimal conditions or in scenarios not recommended by the manufacturer, (c) poor unit maintenance, etc. The warranty does not cover programming or software related issues.
If the product is eligible for PLC Direct’s warranty coverage and the customer encounters an issue with the product, we will request the item is shipped to us for diagnosis and examination. Regardless of the cause of product issues, the customer will bear responsibility for the cost of shipping the unit to PLC Direct for evaluation. Where the unit was damaged by human factors, we will offer a repair or replace quote; in cases where damage was caused by human factors, the customer is responsible for the cost of shipping the repaired/replaced unit from PLC Direct to the customer. Where the unit was not damaged by human factors but is covered by PLC Direct’s warranty, we will repair or replace the unit at our cost (or, in rare cases, refund you your purchase); in such cases, PLC Direct will bear the cost of shipping the repaired or replaced product back to the customer. It is up to PLC Direct’s discretion whether to repair, replace, or refund the customer in such cases. Diagnoses can take time to complete based on technician availability and the complexity of diagnosis.
In no event shall PLC Direct be liable for any damages except actual damages up to, but not exceeding, the amount paid to us for the product, including we shall not be liable for any consequential or indirect damages or lost profits whether or not advised of same.
PLC Direct offers free shipping worldwide. Product ship from a various warehouses worldwide based on the customer's and the product's location. The estimated delivery date on the product page is PLC Direct's best estimated assuming a US-based shipping destination.
Regardless of where the product is shipping from, PLC Direct covers all duties for US-based shipping destinations. For non-US-based shipping destinations, customers are responsible for duties as appropriate.
PLC Direct's focus is on balancing price with lead time. Some but not all products can be expedited. If you have questions about delivery ETAs, please contact our team.

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