Siemens SITAS 4AP2142 1000VA 3-Phase Control Transformer, 400V to 289/230V

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Product Specifications

Brand: Siemens
Part Number: 4AP2142-8BC40-0HA0
Type: Three-Phase Control Transformer
Series: SITAS 4AP
Rated Power: 1000 VA (S6: 3.5 kVA)
Primary Voltage: 400 V (Y500-400 / Δ289-230)
Secondary Voltage: Y 400 V / Δ 230 V
Secondary Current: 1.44-2.50 A
Frequency: 50/60 Hz
Efficiency: 92%
Thermal Class: B (40 °C)
Protection Degree: IP00
Mounting: Screw Mount
Certifications: CE, cRUus, EN 61558-2

Product Description

The Siemens SITAS 4AP2142-8BC40-0HA0 is a 1000 VA (1 kVA) three-phase control transformer delivering 400 V to 289/230 V step-down for industrial control circuits. With 92% efficiency and 3.5 kVA short-term capacity, it reliably powers contactors, relays, and control electronics in demanding automation panels and motor control centers.

Key Features

Low inrush current design enables fuseless protection with SIRIUS 3RV motor starter protectors, eliminating separate fusing and reducing panel wiring
Multi-voltage primary tapping: Y500-400 / Δ289-230 for flexible integration across different supply configurations
50/60 Hz dual-frequency operation covers global industrial power standards
IP00 open-type construction for enclosed panel or cabinet mounting
Screw/tab terminals for secure, low-maintenance connections

Technical Data

Parameter	Value
Rated Power (PN)	1000 VA (1 kVA)
Short-Term Power (S6)	3.5 kVA
Primary Voltage	Y500-400 / Δ289-230 V
Secondary Voltage	Y 400 V / Δ 230 V
Secondary Current	1.44-2.50 A
Frequency	50/60 Hz
Efficiency	92%
Thermal Class	B (40 °C ambient)
Protection Degree	IP00
Dimensions (W x D x H)	219 x 168 x 168 mm
Weight	11.3 kg
Standards	EN 61558-2-1, -2-2, -2-4
Certifications	CE, cRUus

Applications

This transformer is designed for supplying control circuits in industrial machinery, conveyor systems, packaging equipment, and motor control centers where reliable galvanic isolation between mains and control voltage is essential. The low inrush characteristic makes it ideal for fuseless panel designs using SIRIUS 3RV circuit breakers for primary-side protection, reducing BOM cost and panel footprint.