Forcibly guided safety PCB relays rated to 6A/250VAC

December 07, 2016 // By Julien Happich
Elesta’s forcibly guided safety SIS Series PCB relays are what the company claims to be most compact and energy efficient force guided SEN type relays (Sensitive, meaning the coil takes less current to actuate than “standard” type).

The devices feature an innovative notch-crown contact system with a sensitive coil, which renders the relay capable of impressive current switching extremes as low as 3mA and as high as6A/250VAC. 
Fully compliant with DIN standard IEC/EN61810-3 type ‘A’, the SIS Series force guided relays operate with category III protection over voltage. These safety PCB relays incorporate contacts from 1NO+1NC to 4NO+2NC enabling equipment to be designed to comply fully with safety standards.
 
The smallest relay in the SIS Series (SIS212) occupies a mere 7.85 cm 3, with 3 forcibly guided contacts and is believed to be the smallest safety relay on the market worldwide. It can be used in the tightest of spaces, even where a cooling problem exists. The coil’s rated capacity is 0.4 Watt. While the relay responds at 0.22 Watt. The excitation voltage can subsequently be reduced even further.In reduced operation, the relay operates with absolutely minimal inherent consumption (holding capacity) of as little as 0.05 Watt.

A safe electrical separation exists between control and output side. Coil and control contacts are separated from the two output contacts by double and reinforced insulation, with clearance and creepage distances over 8mm. Large air gaps and tracking distances with accordingly high test voltage values, guarantee safe separation of the current circuits throughout the SIS Series. Coil low power dissipation ensures the circuit for relay activation can be kept simple with inexpensive components. The relay is installed directly on the printed circuit board with solder connections. The coil is monostable and of neutral execution. Coils can be produced for all common voltages from 3 to 110 VDC.
 
Visit Willow Technologies at www.willow.co.uk