The 70VA power rating indicates the maximum apparent power the transformer can supply

eliminating the need for wet-rag heat sinking during installation

ignition cycles

This 1/2" bore assembly features a unique hex and round interchangeable design

making it the standard step-down solution for powering thermostats

Allanson Transformers 421-340 Transformer Els PW 17895 The 70VA power rating indicatesThe Allanson 421 340 Ignition Transformer is a heavy duty ferromagnetic transformer engineered specifically for Armstrong and ESSO burners. Designed for constant duty, this double pole transformer operates with a 120Vac supply voltage and delivers a consistent 10,000V secondary voltage at 23mA. Its mid point ground configuration and Rajah connector HV terminal ensure a secure electrical interface for high demand oil burner ignition systems. Built with