MHV series of miniature high voltage reed relays are surface mount and measure 17.2 x 10.5 x 8.5mm.
They can switch up to 1kVdc (or ac peak) and withstand a minimum of 3kVdc.
“Off-state leakage current is in the nanoampere range, and dielectrics strength, coil to contact, is 5kVdc,” according to the company. “MHV relays are particularly suitable where isolation measurements between low and high voltage circuits are frequently monitored. Typical applications include electric vehicles, photovoltaic systems, test and measurement, and medical equipment.”
There are no internal solder joints, and the parts are reflow solderable.
There is only one part in the series: MHV05-1A, with a 5V 140Ω coil and contacts whose other limiting values are 10W, 700mA switched (1.25A carried).
Operating time, including bounce, with 140% pull-in over-drive, is 800μs.
Creepage and clearance distances, said the company, is consistent with IEC 60664-1, ISO 6469-3, IEC 60601-1 and IEC 62109-1/2.
They are tested in accordance with AEC-Q200, UL Approved and are consistent with RoHS and REACH.
BH series reed relays have the same 1kVdc switching and 3kVdc breakdown of the MHV relay, but are available with one, two (photo right), three or four single-pole class-A contacts – each in its own glass encapsulation within the relay’s coil. All leads emerge axially in-line with the package long axis.
“The integrated electrostatic shield and axial switch leads ensures insulation resistance of 10TΩ across the open contacts as well as between the coil and contacts,” said Standex. “Off-state leakage is in the picoampere range, and the outer magnetic shield protects the relays against a mutual interaction and therefore allows an assembly with high density.”
Size is 28mm long plus leads, by ~9mm high and between 8.5 and 19.6mmwide depending on how many contacts the relay has.
Coils with nominal voltages of 5 (100Ω), 12 (400Ω) and 24V (1.6kΩ) are available for each of the four contact arrangements – the four contact 5V version has a 70Ω coil.
Applications are foreseen in automated and semiconductor test equipment, high-insulation and high-accuracy testers, industry and replacing mercury wetted relays.
The MHV product page can be found here, and the page for BH relays here.
Standex Electronics is headquartered in Ohio, and the company has twelve manufacturing facilities spread across the United States, Germany, China, Mexico, the UK, Japan and India. It has over 1,600 employees.
