Overview
The Siemens 3SB1 400-5M pilot light transformer is a compact, shallow-depth voltage step-down transformer designed for 3SB modular pilot light assemblies. It converts 110/127 VAC input to 6 VAC output, providing reliable low-voltage power for indicator lamps in industrial control panels. This unit features integrated lamp mounting and is commonly used in PLC control cabinets, motor starters, and distribution automation enclosures.
Key Features
- Shallow depth design (60 mm) for compact panel mounting
- Converts 110/127 VAC to 6 VAC secondary output
- Integrated pilot light lamp and bulb assembly
- UL/CSA rated for industrial and general-purpose control applications
- Factory new condition, in original packaging
- Compatible with Siemens 3SB modular pilot device line
Technical Specifications
- Primary Voltage: 110/127 VAC, 50/60 Hz
- Secondary Voltage: 6 VAC
- Transformer Type: Shallow depth voltage reducer with snap-on mounting
- Mounting: Panel-mount, screw terminal
- Depth: 60 mm (shallow profile)
- Lamp Type: BA 9s incandescent bulb included
- Standards: UL recognized, CSA certified
- Operating Frequency: 50/60 Hz
- Condition: New in Box
Typical Applications
The 3SB1 400-5M is widely used in:
- PLC and SCADA control panel indicator lighting
- Motor starter and VFD status indication
- Distribution automation and substation control
- Machinery and equipment status monitoring
- Emergency stop and alarm indication circuits
Compatibility & Replacements
The 3SB1 400-5M is part of the modular Siemens 3SB pilot device ecosystem. Other variants in the shallow-depth transformer series include the 3SB1 400-5A (120V/24V), 3SB1 400-5C (240V/24V), and 3SB1 400-5P (240V/6V). Consult voltage and output requirements before substituting. This unit is compatible with all 3SB 30 mm lampholder and contact block accessories. For high-voltage industrial panels, larger transformer options are available in the 3SB1 480V series.
