Siemens 4AM5742-5AJ10 400V to 110V 1000VA Single-Phase Control Transformer

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Product Specifications

Brand: Siemens
Part Number: 4AM5742-5AJ10-0FA0
Product Type: Control Transformer
Series: SITAS 4AM5742
Rated Power: 1,000 VA
Primary Voltage: 400 V (taps: 380/400/420 V)
Secondary Voltage: 110 V
Secondary Current: 9.09 A
Short-Time Power (S6): 5,000 VA
Frequency: 50/60 Hz
Mounting: Screw Mount

Product Description

The SITAS 4AM5742-5AJ10-0FA0 is a 1,000VA single-phase control transformer converting 400V mains to 110V at 9.09A. The three-tap primary (380/400/420V) compensates for voltage variation common in industrial facilities.

Electrical Performance

Rated at 1,000VA continuous with a short-time power rating of 5,000VA (S6 duty) — 5x headroom. The EI 150/90 core achieves approximately 93 percent efficiency. Full galvanic isolation via II0 vector group. 50/60Hz operation.

Mechanical Design

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

Application

Designed for large control panels on European 400V three-phase networks, powering extensive 110V control circuits with multiple motor starters, large contactor banks, and solenoid-operated equipment.

Decision Parameters

Parameter	Value
Rated Power	1,000 VA
Primary Voltage	400 V (taps: 380/400/420 V)
Secondary Voltage	110 V
Secondary Current	9.09 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