Siemens 4AM5742-8ED40 575/550/525V to 230V 1000VA Control Transformer

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Product Specifications

Brand: Siemens

Part Number: 4AM5742-8ED40-0FA0

Product Type: Control Transformer

Series: SITAS 4AM5742

Rated Power: 1,000 VA

Primary Voltage: 575/550/525 V (3-tap)

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 4AM5742-8ED40-0FA0 is a 1000VA single-phase control transformer with a high-range three-tap primary spanning 575/550/525V, stepping down to 230V at 4.35A. Compared to the 8DD40 variant, this model extends primary coverage up to 575V, making it the right choice for Canadian and heavy-industrial installations where mains voltage reaches higher levels.

Electrical Performance

Rated at 1,000VA continuous with a short-time power rating of 5,000VA (S6 duty) — 5x headroom for high-inrush contactor, relay, and solenoid loads. The EI 150/90 laminated core achieves approximately 93 percent efficiency. Full galvanic isolation between primary and secondary via II0 vector group.

Mechanical Design

Substantial 152x144x132mm IP00 open-frame construction for enclosure installation with screw terminals and screw mounting. Class B (130 C) insulation system, rated for 40 C ambient. Weighs approximately 15 kg.

Application

Suited for machine tool control panels, HVAC systems, and industrial automation where 230V control circuits must be supplied from mains reaching up to 575V. Common in Canadian, South American, and heavy-industrial power distribution environments.

Decision Parameters

Parameter	Value
Rated Power	1,000 VA
Primary Voltage	575 / 550 / 525 V (3 taps)
Secondary Voltage	230 V
Secondary Current	4.35 A
Short-Time Power (S6)	5,000 VA
Efficiency	~93%
Insulation Class	B (130 C)
Protection Class	IP00
Dimensions (WxHxD)	152 x 144 x 132 mm
Mounting	Screw Mount