Relays for solar systems
16 March 2011
Switches, Relays & Keypads
Fujitsu Components’ product range includes power relays designed for use in solar energy systems. They have two target functions within the solar converter: DC relays to switch on/off the DC voltage generated by the solar panel; and AC relays with big contact gap, to switch on/off the provision of the generated electricity to the power grid.
The FTR-J2 is a DC relay capable of switching 450 V d.c. at 10 A, and measures 24 x 23,5 x 27 mm (L x W x H). To be able to switch high DC voltages in these small dimensions, Fujitsu has designed two strong permanent magnets into the relay, which are necessary to extinguish the severe breaking arc. The FTR-J2 is a 2 Form A relay that can be used in two different configurations: switching 2 x 200 V d.c. or switching 1 x 450 V d.c. It can handle an inrush current of 150 A (capacitive load) and offers high insulation between contacts and coil with an insulation distance of clearance/ creepage > 6 mm, a dielectric strength of 4000 V a.c. and 10 000 V surge strength.
Additionally, Fujitsu has expanded its FTR-K3 series with two latching versions suitable for solar energy systems. The FTR-K3L-PV is available as a dual coil latching version offering 32 A contact current and a contact gap of 1,5 mm. The FTR-K3L-WG is also a dual coil latching relay with a 1,5 mm contact gap, and features a contact rating of 25 A/250 V a.c. and can handle a carry current of 30 A.
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