November 1, 2008

Varistors: Multiple surge current capability

EPCOS has developed a new and exceptionally rugged series of multiple-pulse MP varistors. These protective components are particularly suited for applications in which frequent overvoltage pulses can be expected, such as in switch-mode power supplies or overvoltage protection modules. The varistors are offered with diameters of 10, 14 and 20 mm. They can withstand surge currents of 1.5 to 5 kA with 15 pulses of 8/20 µs at intervals of 60 seconds. Their response voltages cover the range from 275 to 460 V AC. A version for 130 V AC is currently in development.

This improved performance was achieved by an optimized ceramic production process that leads to significantly lower derating compared with standard ceramics. Approval to UL 1449 3rd Edition Type 2 (permanently connected) applies beginning December 2008.

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