III – Outdoor sheltered
30-35cm – 4 wire
Grade 2 Normally Open 4 wire Flush Single Reed Contact
A single reed flush contact designed to meet the requirements of EN50131 Security Grade 2.
A81NO is also fully sealed with a potting compound, allowing it to work to Environmental Class III.
As this contact is a sealed unit, it is wired with the provided fly lead instead of terminals. Two wires handle the internal switch, while the remaining two function as a tamper loop.
This contact is Normally Open (N/O) – The circuit through the contact is complete until the magnet is moved close by. With the magnet in close proximity, the circuit through the contact is broken.
Fitting screws are provided.