The 4AM3442-8ED40 is a 100VA multi-tap single-phase control transformer from the Siemens SITAS 4AM series, offering 12 discrete primary voltage taps from 230V to 600V with configurable dual 115V secondaries. It extends the multi-tap concept to cover the highest distribution voltages encountered in global industrial installations.

600V-Ready Design

With primary taps reaching 600V and 575V — standard distribution voltages across Canada, parts of South America, and heavy industrial sites in North America — the 8ED40 covers voltage territory beyond the reach of the 8DD40 series (max 550V). The remaining taps (550/525/500/480/460/440/415/400/240/230V) provide full backward compatibility with standard European and Asian networks. This is the go-to transformer for panel builders whose destination markets include 600V-class installations.

Dual Secondary Flexibility

The dual 115V secondaries wire in series for 230V at 0.43A (IEC markets) or in parallel for 115V at 0.87A (North American control standards). This single SKU adapts to both control voltage conventions during panel commissioning — no last-minute transformer swaps. The 310VA S6 short-time rating handles inrush across all configurations.

Key Decision Parameters