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  • One channel
  • 0 to 40mA
  • Voltage drop
    • 9321-SC: 0.2V @ 10mA spur current, 0.4V @ 20mA spur current
    • 9322-SC: 0.94V @ 10mA spur current, 1.88V @ 20mA spur current
    • 9323-SC: 0.3V @ 10mA spur current, 0.5V @ 20mA spur current
  • DC impedance:
    • 9321-SC: 22Ω total spur resistance
    • 9322-SC: 94Ω total spur resistance
    • 9323-SC: 25Ω total series resistance
  • Input voltage:
    • 9321-SC: <17.5V dc
    • 9322-SC: <17.5V dc
    • 9323-SC: <14.8V dc


The MTL spur connectors are DIN-rail mounted and designed to connect field devices to segments powered by FISCO power supplies.

The 9321-SC and 9323-SC spur connectors connect FF816 entity-certified devices to FISCO power supply segments. Both are connected in the spur, limiting the power to be compatible with the safety description (24V, 250mA and 1.2W) of an entity-certified device. The 9321-SC is used for segments powered by a 9121-IS power supply (IIC, Groups A-D), and the 9323-SC is used for segments powered by a 9121-IS (IIC, Groups A-D) or 9122-IS (IIB, Groups C,D) power supply.

The 9322-SC spur connector can be used when field devices are to be mounted in Zone 0, or have an electrical connection into Zone 0. The 9322-SC is connected in the spur to provide EEx ia current limiting, and it is designed to work with the 9121-IS (IIC, Groups A-D) or 9122-IS (IIB, Groups C,D) FISCO power supplies. It can only convert an ‘ib' source to an ‘ia' when the source voltage is clamped to ‘ia' as with the 9121-IS and 9122-IS power supplies.