Siemens SITAS 4AP2742 2500VA 3-Phase Control Transformer, 400V to 289/230V

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Product Specifications

Brand: Siemens

Part Number: 4AP2742-8BC40-0HA0

Type: Three-Phase Control Transformer

Series: SITAS 4AP

Rated Power: 2500 VA (S6: 11 kVA)

Primary Voltage: 400 V (Y500-400 / Δ289-230)

Secondary Voltage: Y 400 V / Δ 230 V

Secondary Current: 3.6-6.26 A

Frequency: 50/60 Hz

Efficiency: 94%

Thermal Class: B (40 °C)

Protection Degree: IP00

Mounting: Screw Mount

Certifications: CE, cRUus, EN 61558-2

Product Description

The Siemens SITAS 4AP2742-8BC40-0HA0 is a 2500 VA (2.5 kVA) three-phase control transformer stepping down 400 V primary to 289/230 V secondary for industrial control circuits. With 94% efficiency and 11 kVA short-term capacity, it delivers reliable power to contactors, relays, solenoids, and control electronics in mid-to-large automation panels and motor control centers.

Key Features

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

Technical Data

Parameter	Value
Rated Power (PN)	2500 VA (2.5 kVA)
Short-Term Power (S6)	11 kVA
Primary Voltage	Y500-400 / Δ289-230 V
Secondary Voltage	Y 400 V / Δ 230 V
Secondary Current	3.6-6.26 A
Frequency	50/60 Hz
Efficiency	94%
Thermal Class	B (40 °C ambient)
Protection Degree	IP00
Dimensions (W x D x H)	242 x 264 x 242 mm
Weight	26.6 kg
Standards	EN 61558-2-1, -2-2, -2-4
Certifications	CE, cRUus

Applications

This transformer is designed for supplying control circuits in mid-to-large industrial machinery, conveyor systems, packaging lines, and motor control centers where reliable galvanic isolation between mains and control voltage is essential. The 11 kVA S6 rating handles high inrush loads from contactor coils and solenoid banks, while the low inrush primary characteristic suits fuseless panel designs using SIRIUS 3RV circuit breakers.