In manufacturing, we custom form the wax pellets for different temperature range specifications. All units are calibrated and tested to confirm switch actuation at their specified temperature The switch is designed using a formed bimetallic contact arm. The bimetal contact movement is achieved using the different expansion rates of two metals fused together. This is a creep action device, provides precise performance Robust design and high grade materials meet the stringent demands of today's service professional As a global manufacturer of original equipment ignition products, we maintain complete quality control throughout the manufacturing process from componentry to finished product In production, all thermal switches are factory-calibrated to make electrical contact at the specified lower-temperature set point In design, we specify custom wax formulations that will expand when heated, activate a snap action electrical contact and transfer the electrical signal to the fan controllerPackage Dimensions: 1.500 x 1.125 x 3.000 inches Package Weight: 0.12 lb Package Quantity: 1 UPC: 091769031534 Attachment Method: Screw-On Bulb Included: No Color/Finish: Gold Connector Gender: Female Connector Quantity: 1 Connector Shape: Round Hardware Included: No Housing Material: Metal Mounting Bracket(s) Included: No Open at Idle: Yes Overall Width: 14.732 MM Switch Actuation Style: Toggle Switch Shape: Round Terminal Gender: Male Terminal Quantity: 1 Terminal Type: Bullet Thread Size: 16MMX1.50 Voltage: 12 Width - Inches: 0.58 Wire Quantity: 0 Wiring Harness Included: No Country of Origin: MX