The 4AM3442-4TT10 is a 100VA 1:1 safety isolating transformer from the Siemens SITAS 4AM series, designed to provide galvanic isolation between a 230VAC supply and a 230VAC load without stepping voltage up or down. It delivers 0.43A continuous with 310VA short-time capability for inrush handling.

Why 1:1 Isolation

Unlike step-down control transformers, the 1:1 ratio blocks common-mode noise, transient spikes, and ground loops while maintaining the original voltage level. This makes it the right choice for floating test bench supplies, medical-grade equipment isolation, and sensitive instrumentation where electrical separation is the primary requirement rather than voltage conversion.

Construction and Standards

The EI 84/42 laminated core with Class B insulation operates reliably at 40°C ambient. IP00 open-style construction mounts via screws or 35mm DIN rail (EN 60715), with screw-type terminals for secure ring or fork lug connections. Certified to EN 61558-2-2 and EN 61558-2-6 safety isolating standards with CE, cRUus, and EAC approvals.

Key Decision Parameters