ABB TR-1 Relay

ABB TR-1 Relay is a classic ABB auxiliary/tel­ephone-type relay that has historically accompanied main protection relays in electrical protection schemes. In ABB catalogs, the TR1 designation is associated with differential-current monitoring, described as both a monitor and a relay for differential currents, which makes it suitable for signaling and triggering actions when imbalances occur. ABB documentation also identifies the TR-1 as an auxiliary unit within the older TR/IRV family of protection devices, specifically noted as a telephone-type relay used for auxiliary signaling in protection circuits. Typical applications include signaling and remote-control roles within switchgear and protection schemes, where monitoring of current differences between paths helps detect faults or abnormal conditions. Because TR-1 originates from legacy ABB equipment, exact electrical interface details—such as contact configuration, coil mechanism, and voltage ratings—vary by installation and revision; always refer to the installation’s ABB data sheet or catalog entry for your model. This product sits in ABB’s historically deployed protection and monitoring lineup, and the precise specification set should be confirmed on the model’s datasheet before integration with any protection scheme.