2450 Thermal Sensor (Bimetal Thermostat) Normally Open, 87-265 F131, Elmwood

2450  Thermal Sensor (Bimetal Thermostat) Normally Open, 87-265 F131

Elmwood 2450 Thermal Sensor, these are NORMALLY OPEN.  The part number is 2450 87-265 F131.  They close at roughly 55°C.  Used in the Hafler DH500, P500, and XL600 audio amplifiers as a thermal switch to increase the speed of a cooling fan when the amplifier temperature got hot enough; so it's NORMALLY OPEN (we verified that it is) and then closes when it gets hot enough (roughly 55°C), in the Hafler case, increasing the fan speed by bypassing a resistor.  Hopefully that gives a general idea of it's temperature operation.  In case it helps, this sensor goes by the Hafler part numbers SWH-119 or SF025; both are the same sensor. 

MFR Part #: Elmwood 2450  87-265 F131

MFR: Elmwood

Limited Quantity Available, New Old Stock