Bourns has introduced a new 90 V Multifuse positive temperature coefficient (PTC) resettable fuse series that has been specifically designed to provide overcurrent protection in broadband cable telephony equipment such as power passing taps and network interface devices (NID) units.
The potential for power crosses or induced high voltages are very real, so networks must provide adequate protection. The 1999 National Electrical Code, which deals with network-powered broadband equipment such as power passing taps, mentions that maximum power must be limited to 100 VA within 60 seconds because of the high risk that currents can pose to the unknowing subscriber. Bourns' new MF-R055/90 and the MF-R075/90 have been designed to act as such current limiters.
A resettable polymer PTC fuse has some very obvious benefits in the area of cable telephony protection. The fact that a PTC automatically resets itself once the fault clears, eliminates the costly and timely service calls of service technicians. The MF-R055/90 with its hold current of 550 mA at room temperature, 350 mA at 60°C and maximum voltage rating of 90 V, suits power passing taps designed to supply single family homes. The MF-R075/90 with its hold current of 750 mA at room temperature, 480 mA at 60°C and maximum voltage rating of 90 V suits power passing taps designed to supply multidwelling units.
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