Functionally the MTL4500 and MTL5500 range of modules are the same but differ in the following way:
the MTL4500 modules are designed for backplane mounted applications
the MTL5500 modules are designed for DIN-rail mounting. In both models the hazardous area field-wiring connections (terminals 1-3, and 4-6) are made through the removable blue connectors, but the safe area and power connections for the MTL454x modules are made
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