3RT2015-1VB42

The 3RT2015-1VB42 is a Siemens SIRIUS S00 miniature 3-pole contactor with a DC24V coil and screw terminals. The main contacts are AC-3 rated at 7A, 3kW/400V. The auxiliary contacts are a set of normally closed (NC) contacts, suitable for power failure protection, abnormal interlocking, or safety circuit designs requiring reverse logic.

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Photo of the normally closed auxiliary contact of the Siemens SIRIUS 3RT2015-1VB42 miniature contactor DC24V.

Product Positioning

The 3RT2015-1VB42 belongs to the S00 miniature contactor family and is a DC24V screw terminal version. Its most distinctive feature is that the built-in auxiliary contact is normally closed (1NC) and never open. The contact is open when energized and remains closed when not energized or during a fault power outage. Therefore, it is often used to design interlock protection, anomaly detection, or safety door circuits, allowing the upper controller to immediately monitor whether the contactor is in an inactive state. The main circuit specifications are the same as other screw terminal models in the same frame, facilitating management with existing spare parts.

Core Product Advantages and Features

1NC normally closed auxiliary contact

The contact logic is the opposite of the normally open type, making it suitable for designing fail-safe interlocking and protection circuits.

DC24V coil

It can be directly driven by PLC output or 24V DC power supply, and is compatible with common low-voltage control systems.

Screw terminal wiring

The terminals are securely locked, making them suitable for wiring applications with significant variations in wire diameter or requiring frequent maintenance.

S00 Small Frame

It is compact in size and shares the same shape as other products in the same series, making it easy to design a unified tray layout.

High mechanical life

With a mechanical operating life of approximately 30 million cycles, it is suitable for automated equipment that operates continuously for extended periods.

project	Specification
model	3RT2015-1VB42
series	Siemens SIRIUS 3RT2 (S00)
Extreme number	3-pole (3P)
coil voltage	DC 24V
Auxiliary contact	1NC (Group 1 normally closed)
Wiring method	Screw terminals
Rated operating current (AC-3)	7A
Rated operating power (AC-3, 400V)	3kW
Mechanical life	Approximately 30 million times
Electrical life (AC-4)	Approximately 200,000 uses (derating).
Enclosure protection rating	IP20
Installation method	35mm DIN rail (EN60715)
External dimensions (height x width x depth)	58 x 45 x 73 mm
net weight	Approximately 0.294 kg
Applicable Standards	IEC 60947-4-1

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