High voltage DC switch reduces photovoltaic costs
Distributor Switchec has introduced Telergon’s S6000N DC switch disconnector to meet the demand as a result of the increased usage of 1500V DC generation in photovoltaic (PV) utility scale systems. Higher voltage systems save cost as they enable longer strings, which means fewer combiner boxes, less wiring and trenching, and therefore less labour costs.
The disconnector is available with different terminal configurations to suit an installation’s specific requirements and needs. The switch can be supplied with its input and output terminals at the top of the switch, at the bottom, or one at the top and one at the bottom.
It is constructed from two, type S6000 switches, mounted back-to-back with built in, internal bridging links that enable the switch to be rated at 1500V DC and also to enable quicker installation.
Available in either 315A or 400A 1500V DC ratings, the switch consists of a contact arrangement with self-cleaning blade contacts and pre-arc zones to ensure long term, fault-free energy transmission, claims the company. The contacts are silver alloy coated for a long, trouble-free electromechanical life. The use of high safety level, self-extinguishing materials is claimed to provide “an excellent level” of electrical installation, low smoke and a high resistance to electromechanical stress.
Accessories and options complement the switches, including extension shafts, auxiliary contacts, terminal shrouds and the manufacturer’s ergonomic handle, with the ability to be padlockable in the off position, a door interlock in the on position, a defeatable feature and it is rated to IP65.
The model joins the S5000 DC range with ratings from 40A 900V DC to 3150A 1,000V DC, the S6000 DC range (125A 500V DC to 630A 1,000V DC). The range is manufactured according to IEC 60947-3 and is RoHS-compliant.