Siemens 4AM4642-4TN00 230V to 24V 400VA Single-Phase Control Transformer

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Product Specifications

Brand: Siemens
Part Number: 4AM4642-4TN00-0EA0
Product Type: Control Transformer
Series: SITAS 4AM4642
Rated Power: 400 VA
Primary Voltage: 230 V (taps: 218/230/242 V)
Secondary Voltage: 24 V
Secondary Current: 16.7 A
Short-Time Power (S6): 1,440 VA
Frequency: 50/60 Hz
Mounting: Screw Mount

Product Description

The SITAS 4AM4642-4TN00-0EA0 is a 400VA single-phase control transformer converting 230V mains to 24V at 16.7A. With the larger EI 120/52 core and 91 percent efficiency, it delivers the current capacity needed for 24VDC control circuits with multiple contactors, relays, and sensors.

Electrical Performance

Rated at 400VA continuous with a short-time power rating of 1,440VA (S6 duty) — providing substantial headroom for high-inrush 24V loads. Primary taps at 218/230/242V (plus or minus 5 percent) ensure stable secondary voltage despite mains fluctuations. Full galvanic isolation via II0 vector group.

Mechanical Design

Compact 122x121x114mm IP00 open-frame design with screw terminals and screw mounting. Class B (130 C) insulation system per IEC 60085. Weighs approximately 5.5 kg.

Application

Suited for industrial control panels, PLC power supplies, and automation systems where 24V is the standard control voltage. The 16.7A secondary current supports multiple branch circuits from a single transformer.

Decision Parameters

Parameter	Value
Rated Power	400 VA
Primary Voltage	230 V (taps: 218/230/242 V)
Secondary Voltage	24 V
Secondary Current	16.7 A
Short-Time Power (S6)	1,440 VA
Efficiency	~91 percent
Insulation Class	B (130 C)
Protection Class	IP00
Dimensions (WxHxD)	122 x 121 x 114 mm
Mounting	Screw Mount