Siemens 4AM5742-5CT10 440V to 230V 1000VA Single-Phase Control Transformer

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Product Specifications

Brand: Siemens
Part Number: 4AM5742-5CT10-0FA0
Product Type: Control Transformer
Series: SITAS 4AM5742
Rated Power: 1,000 VA
Primary Voltage: 440 V (taps: 418/440/462 V)
Secondary Voltage: 230 V
Secondary Current: 4.35 A
Short-Time Power (S6): 5,000 VA
Frequency: 50/60 Hz
Mounting: Screw Mount

Product Description

The SITAS 4AM5742-5CT10-0FA0 is a 1,000VA single-phase control transformer converting 440V mains to 230V at 4.35A. Designed for 440V distribution networks common in UK industrial facilities and marine/offshore installations.

Electrical Performance

Rated at 1,000VA continuous with a short-time power rating of 5,000VA (S6 duty) — 5x surge headroom. The EI 150/90 core achieves approximately 93 percent efficiency. Primary taps at 418/440/462V (plus or minus 5 percent) handle voltage variation on 440V networks. Full galvanic isolation via II0 vector group.

Mechanical Design

Substantial 152x144x132mm IP00 open-frame design with screw terminals and screw mounting. Class B (130 C) insulation. Weighs approximately 15 kg.

Application

Specified for UK industrial control panels, marine electrical systems, and offshore platforms where 440V is the standard distribution voltage. The 230V secondary powers control circuits, instrumentation, and automation equipment in these environments.

Decision Parameters

Parameter	Value
Rated Power	1,000 VA
Primary Voltage	440 V (taps: 418/440/462 V)
Secondary Voltage	230 V
Secondary Current	4.35 A
Short-Time Power (S6)	5,000 VA
Efficiency	~93 percent
Insulation Class	B (130 C)
Protection Class	IP00
Dimensions (WxHxD)	152 x 144 x 132 mm
Mounting	Screw Mount