FSM (EMEKO/FSM AG) – TSRL 92109334 – Electronic Transformer Switching Relay

The TSRL 92109334 is a transformer switching relay from FSM AG (branded under TSRL series), used for soft-starting single-phase transformers up to ~32 A without inrush current. Utilizing a patented pre-magnetizing technique, it gently ramps voltage via controlled impulses ensuring smooth transformer energization. Ideal for control transformers, isolating transformers, filament supply, small distribution transformers, and medical or industrial applications.

 Key Features

• Model / P/N: TSRL 92109334 (TSRL series)  

• Soft-Switching Method: Pre-magnetizes transformer core via unipolar voltage impulses; eliminates inrush and prevents saturation  

• Current Rating: Supports transformers up to 32 A; peak withstand up to 400–500 A for 10 ms  

• Control Voltage: Control input (S1/S2) rated 4–32 V DC, ~1–12 mA for remote on/off switching  

• Voltage Range: Available for 110–135 VAC, 190–260 VAC, 350–450 VAC, 410–560 VAC mains variants  

• Protection & Reliability:

  • Half-wave failure detection with fast shut-off and recovery (~40 ms)  

  • Short-circuit protected; overload limited by circuit breaker/fuse  

• Performance:

  • Leakage current approx. 11 mA @230 VAC

  • Max switching cycles: ~25 successive (packet core), unlimited for toroidal cores  

• Mounting/Connections:

  • DIN-rail or panel mount housing

  • Screw terminals for line/load/control; spring terminals for remote input  

• Standards: CE marked, EMC compliant (EN 50081‑1/EN 50082‑2); insulation overvoltage category III