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Standards Development
This standard is applicable to fire-extinguishing thermal-links for installation on printed boards or in free- standing end products. These devices are designed to respond to abnormal conditions of the controlled load at a predetermined temperature, breaking the circuit and simultaneously releasing an extinguishing agent.
Note – A fire-extinguishing thermal-link does not replace the function of a fuse.
The information in this standard supplement or modifies the corresponding provisions of IEC 60691, Thermal- links - Requirements and application guide.
The requirements of this standard concern the product’s electrical intrinsic safety and the effectiveness of the function. The effectiveness of these products in combination with a specific end product is beyond the scope of this standard.
The requirements of this standard are applicable only to fire-extinguishing thermal-links which, when tripped, release a non-conductive extinguishing agent (e.g., halogenated hydrocarbons) and do not impair safe use under normal operating conditions.
This standard is applicable to fire-extinguishing thermal-links with rated voltages not exceeding V and rated currents not exceeding 63 A.
It is not intended that fire-extinguishing thermal-links be replaced by the end user of an electrical/electronic appliance.
Many fires in the industry arise inside of devices and machinery. Current fire prevention concepts are good, but only start extinguishing when the fire is outside of devices. But, it would be most effective to extinguish a fire at the source of origin, before the fire spreads.
Circuit interrupters with fire extinguishing agent consist of a thermal cutoff in combination with a bulb containing fire extinguishing material. When the thermal cutoff opens it ruptures the bulb releasing the extinguishing agent.
The circuit will be cut reliably and the extinguishing agent can extinguish a surrounding fire.
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