DIGITAL (ON/OFF) OUTPUTS

　　Alarms, LEDs, solenoids valves, etc

　　For these applications, the MTL7728+ is recommended. Higherpowered versions are available: the MTL7728P+ is suitable for IIC applications; the MTL7729P+ for IIB applications.

　　If the control switch is to earth, then the 2-channel MTL7787+ barrier should be used, or, alternatively, the MTL7787P+ higher-power version. If the supply is poorly regulated use the MTL7707+.

　　The MTL7707+ is recommended for applications where an unregulated supply of up to 35V is used.

　　POSITIVE DC SYSTEMS

　　Low-level to 12V dc systems

　　The two channels of the MTL7764+ and MTL7767+ can be combined safely in IIC. The MTL7764+ can be used for low-level logic return signals whilst the MTL7767+ is used for 6V dc and 12V dc systems.

　　18V dc systems The single-channel MTL7722+ is recommended for 18V dc systems.

　　AC AND DC SYSTEMS

　　High-level ac and dc systems

　　The versatile star-connected MTL7765ac and MTL7778ac allow Vwkg to be developed from each channel to ground but only allow Vwkg to be developed between channels. This provides some common-mode voltage capability and can allow higher cable parameters to be used.

　　NEGATIVE AND FLOATING POWER SUPPLIES

　　Digital (on/off) outputs

　　The MTL7728– is used with a negative power supply and positive earth. Typically used for digital inputs or outputs, as shown. The MTL7728-- can also be used with floating power supplies, for transmitters.

　　SPARE CABLE CORES AND SCREENS

　　The MTL7799 dummy barrier is used primarily for securing and earthing unused cables and screen connections. Hazardous area terminals 3 and 4 are internally connected to the DIN-rail mounting/ earth connection. It also provides a power bus connection for direct connection of power for modules such as the MTL7743 and MTL7744 where no power supply screw terminal is provided.