Siemens 4AM3442-5AN00 400V to 24V 100VA Single-Phase Control Transformer

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Product Specifications

Brand: Siemens
Part Number: 4AM3442-5AN00-0EA0
Product Type: Single-Phase Control / Safety Isolating Transformer
Series: SITAS 4AM3442
Rated Power: 100 VA
Primary Voltage: 400 V ±5% (380/400/420 V taps)
Secondary Voltage: 24 V
Secondary Current: 4.17 A
Short-Time Power (S6): 310 VA
Frequency: 50/60 Hz

Product Description

The 4AM3442-5AN00 is a 100VA single-phase control transformer from the Siemens SITAS 4AM series, designed to deliver 24VAC at 4.17A from a standard European 400V three-phase panel supply. It combines control, safety isolating, and line transformer functions in a single compact unit.

Everyday Control Power

24VDC-controlled contactors, relays, and PLC I/O modules dominate modern industrial panels, and this transformer provides the AC source for the DC power supply that feeds them. The 310VA S6 short-time rating ensures stable voltage during contactor pull-in — no brownout resets, no nuisance tripping. The EI 84/42 core with Class B insulation delivers 86% efficiency at rated load and reliable operation at 40°C ambient.

Panel-Ready Design

IP00 open-style construction mounts via screws or 35mm DIN rail (EN 60715). Screw-type terminals accept ring or fork lugs. The ±5% primary taps (380/400/420V) accommodate site voltage variations without derating. Certified to EN 61558-2-2 and EN 61558-2-6 with CE, cRUus, and EAC approvals.

Key Decision Parameters

Parameter	Value
Rated Power (Continuous)	100 VA
Short-Time Power (S6)	310 VA
Primary Voltage	400 V ±5% (380/400/420 V taps)
Secondary Voltage	24 V
Secondary Current	4.17 A
Frequency	50/60 Hz
Efficiency	86%
Insulation Class	Class B (40°C ambient)