The Siemens 5ST3020 is a genuine SENTRON fault signal auxiliary contact designed to provide reliable remote indication of fault tripping in Siemens miniature circuit breakers and residual current protection devices. Featuring 1 Normally Open (1NO) and 1 Normally Closed (1NC) contact, this accessory enables fast and accurate monitoring of breaker status in industrial, commercial, and residential electrical installations.
The 5ST3020 is compatible with Siemens 5SL, 5SY, and 5SP Miniature Circuit Breakers (MCBs), 5SU1 Residual Current Operated Circuit Breakers with Overcurrent Protection (RCBOs), and 5SV Residual Current Circuit Breakers (RCCBs/FIs). For installation with 5SU1 RCBOs, the 5ST3805-1 handle coupler is required to ensure proper mechanical operation.
Designed for quick side mounting, the fault signal contact transmits the status of the protective device to PLCs, alarm systems, BMS (Building Management Systems), SCADA systems, and remote monitoring equipment. Manufactured to Siemens SENTRON quality standards, it offers long mechanical life, reliable switching performance, and easy installation, making it ideal for modern electrical distribution and automation systems.
| Parameter | Specification |
|---|---|
| Manufacturer | Siemens |
| Part Number | 5ST3020 |
| Product Series | SENTRON 5ST3 |
| Product Type | Fault Signal Contact |
| Contact Configuration | 1NO + 1NC |
| Function | Fault Trip Indication |
| Mounting Type | Side-Mounted Accessory |
| Compatible MCB Series | 5SL, 5SY, 5SP |
| Compatible RCBO Series | 5SU1 |
| Compatible RCCB Series | 5SV |
| Handle Coupler Requirement | 5ST3805-1 (Required for 5SU1 RCBO) |
| Rated Insulation Voltage | 500 V |
| Degree of Protection | IP20 |
| Mechanical Life | High Mechanical Endurance |
| Standards | IEC 60947-5-1 |
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