ABB LTD GBCON OEA28 auxiliary contact module is suitable for OT200 to OT800 switch fuses. Mounts on the left side of the switch, maximum 8 auxiliary contact blocks with the OEA28 module. Mounting under the mechanism cover. The test contacts can be used as standard auxiliary contacts as well. Auxiliary contacts for 3 + N types only with the OEA28 module.