Reed relay handles multi-kV 100W switching

The 67 change-over relay is rated at up to 5kV stand-off and 2.5kV switching at 100W maximum.

“In applications where high voltage signals need to be routed to alternate points, polarity reversing, capacitor charge or discharge for example, a high voltage SPDT – Form C – relay would be the ideal solution,” said Pickering technologist Kevin Mallett. “These are often implemented using two normally-open single pole 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.”

The package is 58.4 x 12.6mm with narrowed ends – the same size as a standard Series 67 relay. They can be mounted in an offset pattern to save space (image right).

There are three versions

• 67-1-C-5/5D – 5V 40Ω coil
• 67-1-C-12/5D – 12V 150Ω coil
• 67-1-C-24/5D – 24V 600Ω coil

In each case, contacts are tungsten-plated. Max initial contact resistance is 500mΩ (Form A variants are 120mΩ) and insulation resistance from contact to contact and contact to coil are both 10¹⁰Ω (Form A variants are 10¹²Ω).

Capacitance depends on the way the three terminals are treated. As a guide, the more straight-forward Form A types are 3pF closed-switch-to-coil and 0.15 across open contacts.

EMI screening is included, as is the company’s SoftCenter anti-shock construction.

The product page is here

Pickering Electronics was formed over 50 years ago to design and manufacture high quality reed relays, principally for instrumentation and test equipment. It sells to automatic test equipment and Semiconductor companies worldwide.