Siemens 4AM3442-5FT10 500V to 230V 100VA Single-Phase Control Transformer

1 / 5

Product Specifications

Brand: Siemens
Part Number: 4AM3442-5FT10-0FA0
Product Type: Single-Phase Control / Safety Isolating Transformer
Series: SITAS 4AM3442
Rated Power: 100 VA
Primary Voltage: 500 V ±5% (475/500/525 V taps)
Secondary Voltage: 230 V
Secondary Current: 0.43 A
Short-Time Power (S6): 310 VA
Frequency: 50/60 Hz

Product Description

The 4AM3442-5FT10 is a 100VA single-phase control transformer from the Siemens SITAS 4AM series, built to supply 230VAC at 0.43A from a 500V three-phase distribution bus. It powers contactor coils, relay logic, and auxiliary circuits in facilities running the legacy 500V industrial network standard.

500V Industrial Networks

Before the European harmonization to 400/230V, 500V was a common industrial distribution voltage — and many plants, mines, and infrastructure sites retain it today. Upgrading the entire distribution network is cost-prohibitive, so transformers like the 5FT10 enable modern 230VAC control equipment to run from the existing 500V bus. The ±5% taps (475/500/525V) allow tuning for site-specific voltage levels.

Panel Integration

The EI 84/42 laminated core achieves 86% efficiency with Class B insulation for 40°C ambient. IP00 open-style, screw or 35mm DIN rail mounting. The 310VA S6 short-time rating ensures clean contactor pull-in during simultaneous coil energization. Certified to EN 61558-2-2 and EN 61558-2-6 with CE, cRUus, and EAC approvals.

Key Decision Parameters

Parameter	Value
Rated Power (Continuous)	100 VA
Short-Time Power (S6)	310 VA
Primary Voltage	500 V ±5% (475/500/525 V taps)
Secondary Voltage	230 V
Secondary Current	0.43 A
Frequency	50/60 Hz
Efficiency	86%
Insulation Class	Class B (40°C ambient)