Confirm the exact configuration
Use the manufacturer part number and model code—not appearance alone. Connection, size, material, voltage, pressure, seal, and control options can differ within the same product family.

Festo
The Festo 543861 is an oil-resistant industrial component utilizing a magnetic reed measuring principle with a contact-based, bipolar N.O. contact switching output. It operates within an ambient temperature range of -40 °C to 70 °C and features an operating voltage range of 5 V to 30 V AC, supporting a maximum output current of 500 mA and a max AC switching capacity of 10 VA. This RoHS compliant device carries the RCM compliance mark, c UL us - Listed (OL) certification, and bears CE and UKCA markings as per EU and UK directives for EMC and RoHS. Submit the exact part number, quantity, and application requirements for a formal quote.
Industrial and obsolete parts are priced per enquiry: the final price depends on available stock, condition, quantity, and your delivery destination, so a fixed list price would be misleading. Request a quote and we confirm current pricing, lead time, and sourcing options — including hard-to-find and discontinued Festo references — within one business day.
For a faster response, include quantity, condition, and delivery destination.
Verified configuration
Engineering context
Use the manufacturer part number and model code—not appearance alone. Connection, size, material, voltage, pressure, seal, and control options can differ within the same product family.
Provide quantity, delivery country and ZIP/postal code, required condition, target date, and photographs of the existing nameplate when available.
Our sourcing response is prepared against Festo 543861. Final compatibility remains subject to the machine manufacturer’s requirements and complete application data.