Overview
The STI 43530-0320 (also referenced as MS4432X) is a compact 102mm light curtain transmitter from the MiniSafe product line. This safety sensor transmitter is designed to work in tandem with a compatible receiver to create a protective sensing beam across machine access points and perimeters. The unit is supplied in used condition, fully tested and functional for immediate integration into existing automation systems.
Key Features
- 102mm (4″) sensing height for compact machine guarding applications
- MiniSafe series design—compact and durable for industrial environments
- Transmitter-only configuration; pairs with compatible MS4432X receiver
- Two-box design with minimal external wiring required
- LED beam indicator for quick visual diagnostics
- Suitable for safety-critical machinery and perimeter protection
Technical Specifications
| Model Number | MS4432X (Part 43530-0320) |
| Product Type | Light Curtain Transmitter |
| Sensing Height | 102mm (4″) |
| Product Line | STI MiniSafe |
| Configuration | Transmitter (Emitter) |
| Condition | Used, Tested |
| Mounting | Direct mounting bracket (standard MiniSafe installation) |
| LED Indicators | Beam status indicator |
Typical Applications
- Machine guard protection on presses, shears, and punch machines
- Perimeter safety screening for industrial equipment
- Access control to hazardous machinery zones
- Conveyor and transfer line safeguarding
- Automated motion control applications requiring personnel protection
Compatibility & Replacements
Compatible With
- STI MiniSafe receiver modules (MS4432R for matching transmitter/receiver pair)
- Safety control relays and logic controllers with 24 VDC input circuits
- Industrial automation systems requiring OPTO-isolated safety inputs
- Machines manufactured for STI light curtain integration
Replaces / Drop-In Replacement For
- Direct replacement for STI part 43530-0320 in existing MiniSafe applications
- Verify compatibility with your specific machine configuration before ordering
Works With
- Industrial PLC safety I/O modules with 24 VDC input capability
- Safety relay modules and emergency stop circuits
- Standard industrial control cabinets with 24 VDC availability
- Programmable Logic Controllers (PLCs) from Allen-Bradley, Siemens, Mitsubishi, and Omron










