HV SPDT Form C reed relays save space

Kevin Mallett, Technical Specialist at Pickering Electronics, explained: “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 often 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.” Pickering’s new 67-1-C high voltage reed relay guarantees break-before-make operation in a single, compact part.

Rated at up to 5kV stand-off, 2.5kV switching at 100W (max), the new Series 67 changeover relays measure just 58.4x12.6mm – the same size as a standard Series 67 relay – and are available with five, 12 or 24V coils. Devices feature PCB connections to switch and coil. Like many Pickering reed relays, the Series 67 parts benefit from internal EMI screening and SoftCenter construction. The fully-encapsulated, single-in-line relays employ tungsten-plated contacts. Optional flying leads are available for high voltage connections.

Mallett added: “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.”