Siemens 4AM3442-5CT10 440V to 230V 100VA Single-Phase Control Transformer

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Product Specifications

Brand: Siemens
Part Number: 4AM3442-5CT10-0FA0
Product Type: Single-Phase Control / Safety Isolating Transformer
Series: SITAS 4AM3442
Rated Power: 100 VA
Primary Voltage: 440 V ±5% (418/440/462 V taps)
Secondary Voltage: 230 V
Secondary Current: 0.43 A
Short-Time Power (S6): 310 VA
Frequency: 50/60 Hz

Product Description

The 4AM3442-5CT10 is a 100VA single-phase control transformer from the Siemens SITAS 4AM series, designed specifically for 440V supply environments where 230VAC control power is required. It delivers 0.43A continuous with 310VA S6 short-time capacity for inrush-heavy loads.

440V Applications

440V three-phase distribution is standard in marine and offshore electrical systems (IEC 60092), many North American heavy-industrial facilities, and regions where the legacy 440/460V network voltage persists. This transformer allows control circuits to run at 230VAC directly from the 440V bus without an intermediate step-down stage. The ±5% primary taps (418/440/462V) provide adjustment margin for site voltage variations.

Construction

The EI 84/42 laminated core delivers 86% efficiency with Class B insulation for 40°C ambient operation. IP00 open-style construction mounts via screws or 35mm DIN rail (EN 60715). Screw-type terminals accept ring or fork lugs. Certified to EN 61558-2-2 and EN 61558-2-6 safety isolating standards with CE, cRUus, and EAC approvals.

Key Decision Parameters

Parameter	Value
Rated Power (Continuous)	100 VA
Short-Time Power (S6)	310 VA
Primary Voltage	440 V ±5% (418/440/462 V taps)
Secondary Voltage	230 V
Secondary Current	0.43 A
Frequency	50/60 Hz
Efficiency	86%
Insulation Class	Class B (40°C ambient)