“The relay features 12.5kV switching at a maximum of 50W,” according to the company. “Tungsten-plated contacts ensure a long and reliable life, supporting up to 100 million operations when cold switching.”
Footprint is 63.5 x 19mm, and they have coil terminals on the bottom and the high-voltage contact terminals on top (see photo).
There are two parts, both with 24V coils:
- 63-1-A-24/4 has a single normally-open (1 Form A) contact and a 350Ω coil.
- 63-1-B-24/4 has a single normally-closed (1 Form B) contact and a 200Ω coil.
Both have internal mu-metal magnetic screens and, when EMC is critical, special versions can be manufactured with an electrostatic screen or earth connection to the magnetic screen.
Form A (energise-to-make) versions to be mounted side-by-side but, as they are magnetically biased, Form B versions should be mounted 25mm or more from other relays, and not be mounted directly onto ferrous metal chassis, as magnetic interaction will alter the coil operating characteristics.
In addition, the coils of Form B relays are polarity sensitive, with the positive connection is identified by a red spot.
The relays are attached by a pair of integrated M4 threaded nylon rods that protrude downwards (see photo), for which fixing nus are provided. The coil terminals (not visible in photo) sit between these rods.
Initial contact resistance is 0.12Ω in both cases. Up to 3A can be switched, and up to 3.5A carried.
Although mechanical life is expected to be >108 operations “at higher voltages up to a maximum 50W resistive load, typical life is 106 operations”, according to the company. “In abusive conditions – high capacitive in-rush current, for example, this figure reduces considerably.”
Maximum closing time including bounce is 3ms, and the contacts open in 2ms.
Capacitance between the closed contacts and the coil is ~3pF, while between open contacts it is ~150fF.
Operation is over -20 to +85°C
Applications are expected in hi-pot testers, cable testers, electric vehicle charger testers, solar energy systems, medical equipment and high voltage instrumentation.
Find the two 20kV relays on this Pickering data sheet
Also for electric vehicle charging, but at the other end of the power scale, Omron has a relay that can switch 800V 50A in an emergency
