Siemens 4AM5742-4TN00 230V to 24V 1000VA Single-Phase Control Transformer

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Product Specifications

Brand: Siemens

Part Number: 4AM5742-4TN00-0EA0

Product Type: Control Transformer

Series: SITAS 4AM5742

Rated Power: 1,000 VA

Primary Voltage: 230 V (taps: 218/230/242 V)

Secondary Voltage: 24 V

Secondary Current: 41.7 A

Short-Time Power (S6): 5,000 VA

Frequency: 50/60 Hz

Mounting: Screw Mount

Product Description

The SITAS 4AM5742-4TN00-0EA0 is a 1,000VA single-phase control transformer converting 230V mains to 24V at 41.7A. With the largest core in the SITAS lineup (EI 150/90), it powers extensive 24V control networks in large automation panels.

Electrical Performance

Rated at 1,000VA continuous with a short-time power rating of 5,000VA (S6 duty) — 5x headroom for massive inrush from large contactors and motor starters. The EI 150/90 core achieves approximately 93 percent efficiency. Primary taps at 218/230/242V. 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, rated for 40 C ambient. Weighs approximately 15 kg.

Application

Designed for large-scale industrial control panels, multi-motor MCC sections, and process automation systems where the 24V control bus must supply dozens of contactors, relays, PLC racks, and HMI panels simultaneously.

Decision Parameters

Parameter	Value
Rated Power	1,000 VA
Primary Voltage	230 V (taps: 218/230/242 V)
Secondary Voltage	24 V
Secondary Current	41.7 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