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.
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