Radiodetection TX-121 Isolation Transformer The Radiodetection TX-121 Isolation Transformer is designed for use with the Tx range of transmitters to apply a low-frequency signal across shorted phases on LV cables . This enables the location of phase-to-phase faults in low-voltage networks by safely coupling the transmitter signal into the circuit. It is rated for connection to CAT IV mains circuits up to 230V phase-to-neutral, with a maximum phase-to-phase voltage differential of 3V rms at 50/60Hz. Key Features • Isolation transformer for Tx range transmitters • Enables low-frequency signal application across shorted LV cable phases • Assists in locating phase-to-phase faults in low-voltage networks • Rated for CAT IV mains circuits up to 230V phase-to-neutral • Maximum 3V rms phase-to-phase voltage differential (50/60Hz) • Designed for safe, controlled fault-finding applications