Omron is aiming at electric vehicle chargers and solar photovoltaic installations by adding a low contact resistance model to its two-pole single-throw G7L-2A-X series of PCB-mount relays.

Omron G7L-X relay
G7L-2A-X-SI has 10mΩ maximum contact resistance, compared with 100mΩ maximum for existing members of the family.

Nominal rating is 30A at 600Vdc, or 25A at 1000Vdc (but see below).

Versions with 12V (190mA 63Ω) and 24V (96mA 250Ω) coils are available – the coil needs an external diode and a Zener (in series) connected across it. A lower ‘hold’ voltage can be applied after switching to reduce dissipation from ~2.3W to ~600mW – this is compulsory when relays are used side-by-side.

 

Although the coils are non-polarised, the contacts are polarised – the design includes a magnetic assist to reduce switching time, nominal maximum switching time is 30ms either way.

For nominal ‘normal’ polarity, resistive load electrical life is 100 operations (25A, 1,000Vdc, 85°C) or 6,000 operations (30A, 600Vdc, 85°C).

When connected in reverse, electrical life is 5,000 operations (30A, 600Vdc, 85°C) – 1,000V operation is not available.

Omron G7L-X relay connectionsThe two contacts are intended to switch a single circuit (left, ‘normal’ polatity). If they are used directly in series, total contact gap is 6mm. They can also be used on either side of a battery or load for total isolation (‘break-all-lines’ connection in the data sheet).

“The G7L-X series conforms to UK and IEC solar inverter standards, as well as applicable UL and VDE electrical standards,” according to the company.

IEC and UL creepage is 16mm minimum, and clearance 8mm minimum.

Dimensions are 52.5 x 35.5 x 41mm and 100g.

Find the G7L-2A-X-SI on this data sheet – this is well-written, although specifications relevant to the low contact resistance type are scattered alongside those for the other types, so careful reading is advised.