DUELCO, represented in Australia by Sentec , has released the NST-2004 category 4 safety relay. It offers a large number of features but is housed in a 22.5mm-wide DIN rail mountable enclosure. The relay is available with detachable terminals.
The NST-2004 has three normally open safety contacts and one signal output for direct connection to a PLC. Two channel inputs from E-stop circuits, gate switches or light guards are supported and the reset circuit may be configured for either manual, automatic or manual monitored reset operation.
Wiring is kept to a minimum using internal dipswitches in the button of the housing though a configuration hole to configure the relay allowing a number of different reset options to be easily set. It is possible to choose between two different types of signal output, set by an slide switch in the button of the housing.
A current limited input means that safety light curtains, gate switches and some safety noncontact switches can be used safely.
Versions are available in 24V dc, 24V ac, 48V ac, 115V ac and 230V ac supply, with either fixed or detachable terminals.