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Product Attributes

Introduction

Thermal cutoff (TCO) devices respond to temperature by interrupting a circuit when the operating and/or ambient temperature exceeds the device's thermal rating. NTE's radial-lead TCOs achieve circuit interruption through an internal fusible alloy that melts upon reaching its melting point, using the alloy's surface tension to form two separate balls at the lead ends, thereby permanently opening the circuit. Currently, axial-lead TCO devices are more prevalent than radial-lead devices, due at least in part to the design challenges involved in manufacturing reliable and cost-effective radial-lead TCOs. However, in many circuit applications, radial-lead devices are preferred because they occupy a smaller footprint on PCBs. Their compact size facilitates assembly into the smallest transformers, ensuring comprehensive thermal protection.

Features

• Maximum ratings: 5 amperes, 250 volts
• Typical operating temperature tolerance: +1 - 2℃
• Full 2 3/4° leads, suitable for all replacement configurations
• All types comply with UL E214712 and VDC-40017057, RoHS compliant