Description

A single pole/changeover contact thermal cut oput, having a fixed temperature bi metal disc actuating a switching mechanism providing for the automatic opening and closing  of an electrical circuit. All parts are mounted on a phenolic base being provided with mounting ears for attaching the protector to a flat or recessed surface.

Application

Heavy duty thermal protection, (insensitive to current) for, i) Heating appliances, dryers, ii) thermostatic control for main pressure and instantaneous hot water systems, electronic components and enclosures and aire conditioning heater banks.

Operation

i) SPST; Single pole make or break contacts only. The operation of the contacts are factory set so that they either make or break an electric circuit on temperature rise and automatically reset when safe operating temperatures are restored. Manual reset cut-outs interrupt a circuit on temperature rise only and are reclosed by pressing the push button after equipment has normalized and/or faults rectified.

ii) SPDT; Change over contact positon option is available whereby a common line is interrupted from one circuit and connected to another circuit simultaneously on temperature rise.

Closed face thermostat (C/F)

Temperature sensing is achieved by surface to surface contact, IE; attachuing the front flat face of the protector onto a flat surface of the equipment to be monitored. Changes in temperature are conducted through the metallic housing cap and directly onto the bi-metal disc which snaps over to operate a set of contacts after a pre-determined temperature has been reached.

Open face thermostat (O/F)

The bi-metal disc is exposed to facilitate good response to changes in surrounding temperature, the exposed face directed at the medium to be monitored, eg; airstream in dryers, air conditioning ducts.