4AM3242-5AJ10-0FA0 63VA Transformer 400V/110V 190VA S6, Siemens

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Product Specifications

Brand: Siemens
Part Number: 4AM3242-5AJ10-0FA0
Type: Control Transformer
Series: SITAS
Rated Power: 63 VA (S6: 190 VA)
Primary Voltage: 400 V AC (taps: 380/400/420 V)
Secondary Voltage: 110 V AC
Secondary Current: 0.57 A

Product Description

The Siemens 4AM3242-5AJ10-0FA0 is a 63 VA SITAS control transformer stepping down a 400 V AC line supply to 110 V AC at 0.57 A, designed for control circuits in machinery powered from three-phase 400 V distribution systems with a 190 VA S6 short-time reserve for contactor switching.

Electrical Design

400 V primary with three voltage taps (380/400/420 V) compensates for ±5% supply variation common in industrial grids
110 V AC secondary — standard control voltage for auxiliary circuits, relays, and solenoid valves
63 VA continuous power with 190 VA S6 rating ensures reliable contactor pull-in without voltage sag
85% efficiency and 8.4% short-circuit impedance deliver stable output voltage across the load range

Technical Specifications

Parameter	Value
Rated Power (Pn)	63 VA
Short-Time Power (S6)	190 VA
Primary Voltage	400 V AC ±5% (380/400/420 V taps)
Secondary Voltage	110 V AC
Secondary Current	0.57 A
Efficiency	85%
Short-Circuit Voltage	8.4%
Core Type	EI 84/28
Thermal Class	B (IEC 60085)
Protection Class	IP00
Dimensions (W×H×D)	86 × 98 × 90 mm
Weight	1.70 kg
Standards	EN 61558-2-1, -2-2, -2-4
Certifications	CE, UKCA, cRUus, EAC

Installation and Related Models

Mounts via screws or snap-on DIN rail inside control cabinets. For systems with a 230 V mains supply rather than 400 V, the 4AM3242-4TJ10-0FA0 provides the same 110 V secondary output from a 230 V primary, also within the SITAS 63 VA range with 190 VA S6 capability.