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Product Attributes

Introduction

This specification applies to the alloy-type thermal cutoff S115. A thermal cutoff, also known as a thermal cut-out or thermal fuse, is a one-shot, non-resettable device. The alloy-type thermal cutoff uses a fusible alloy as the temperature-sensing element. The rated functioning temperature is the temperature at which the alloy-type thermal cutoff opens when heated under a load current of 10 mA, with a tolerance of Tf + 0 - 10 °C (GB/T 9816, EN 60691, K60691) or Tf ± 7 °C (J60691). The measured functioning temperature is the opening temperature measured when the device is immersed in an oil bath, carrying a load current of no more than 10 mA, and heated at a rate of 0.5 °C ~ 1 °C per minute. The holding temperature is the maximum temperature at which the device remains open-free when continuously carrying the rated current for 168 hours. The maximum temperature is the highest temperature the device can withstand within a specified time without impairing its mechanical and electrical characteristics. The rated current is used for classification of alloy-type thermal cutoffs, representing the maximum current permitted in a circuit that can be safely interrupted.