Intrinsically Safe power supply
9491-PS
- II 3G (1)G (2)G Ex nAc [ia] [ib] IIB T4
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−20°C to +70°C
The 9491-PS Power Supply is the preferred method for supplying the 9460-ET series of instrinsically safe Ethernet modules and is based on an isolating power supply. It takes a 24V DC safe area / Zone 2 supply and produces an intrinsically safe, 12V DC nominal output capable of powering the Ethernet modules mounted in a Zone 1 hazardous area.
Each 9491-PS can power a single Ethernet module. In order to provide multiple outputs required for several Ethernet modules, the 9491-PS power supply module is ganged up to the required number of ways, either DIN-rail mounted or using the power distribution backplane to simplify the 24VDC input connection to the modules.
The 9491-PS module has LED power indication for both input and output along with internal current limiting and electronic auto-reset circuit breaker action to protect the module in the event of its output being short circuited or overloaded. This also minimises the power dissipation during the fault to a negligible level, thus improving reliability.
The output can be from either the Ex ia IIB or Ex ib IIB output connectors depending upon application. The 'ib' IIB output providing a higher useable output power where the Gas Group and Zone allows.
