H20A is a heavy-duty angle contact that comes complete with 50cm of armoured wiring. Internals are enclosed in a cast aluminium housing. The armoured 6-wire setup makes EOL resistors easy to add for a supervised circuit, using a suitable JB to house the additional wiring.
This double reed variant operates in DPST configuration, allowing two separate circuits to be switched simultaneously. See code H10A for the single reed, SPST variant.