Pickering Electronics has introduced a new changeover 1 Form C version of its Series 67 high voltage PCB relay that saves space and makes design simple. The company's new reed relay guarantees break-before-make operation in a single, compact part.
Kevin Mallett, technical specialist at Pickering Electronics, explains: "In applications where high voltage signals need to be routed to alternate points, polarity reversing, capacitor charge or discharge, for example, a high voltage Changeover relay (SPDT/Form C) would be the ideal solution. These are frequently implemented using two Normally Open (SPST/Form A) high voltage relays by ensuring that one switch is always opened before the second switch is closed. This requires twice the PCB area and can cause complex driving issues. Also, if either of the SPST relays sticks, then there is risk of unintentionally shorting signals."
Rated at up to 5kV stand-off, 2.5kV switching at 100W (max), the new series changeover relays measure only 58.4mm x 12.6mm – the same size as a standard Series 67 relay – and are offered with 5V, 12V or 24V coils. Devices offer PCB connections to switch and coil. Like many of the company's reed relays, the parts benefit from internal EMI screening and SoftCenter construction. The fully-encapsulated, single-in-line relays use tungsten-plated contacts. Optional flying leads are offered for high voltage connections.
Adds Mallett: "The new 67-1-C high voltage reed relays provide a ready-made solution that is simple to integrate into a new high voltage design, as well as saving substantial PCB area."