NEW ARRIVAL: Siemens SIRIUS 3UG4511-1BP20 Phase-Sequence Monitoring Relay Now Available
Model Description
We are pleased to announce the immediate availability of the Siemens SIRIUS 3UG4511-1BP20 phase-sequence monitoring relay, a compact 22.5 mm-wide DIN-rail device engineered to protect three-phase motors and generators against incorrect phase rotation. Rated for 320 … 500 V AC (50/60 Hz), the relay continuously monitors the order of L1-L2-L3 and energises its DPDT change-over contacts only when the correct sequence is present. Two isolated relay outputs (3 A @ 250 V AC, 1 A @ 24 V DC) provide instant signalling to contactors, PLCs or BMS panels, enabling automatic lock-out of drives before damage occurs. Screw-clamp terminals accept 0.5 … 4 mm² conductors, while the IP20 housing and –25 … +60 °C operating range suit harsh control-panel environments .
Key Features
3UG4511-1BP20 delivers a 450 ms maximum response time and 6 kV impulse withstand, ensuring fast yet reliable supervision even on networks with high inrush or distortion. The device is maintenance-free and self-resetting: contacts close immediately when the correct sequence is restored, eliminating manual reset delays on temporary phase swaps. Integrated potential isolation (input/output/supply) prevents earth-fault loops, and 15 g/11 ms shock resistance keeps the relay stable on vibrating skids or compressor frames. CE, cULus, CCC, EAC and RoHS approvals validate global projects, while the non-volatile design guarantees > 20-year service life. Power consumption is < 3 VA, so the unit does not burden small control transformers .
Related Models in the 3UG4 Family
The 3UG4 line offers complementary functions within the same 22.5 mm footprint. 3UG4511-2BQ20 adds an adjustable time-delay (0.1 … 10 s) to prevent nuisance trips during phase-bank switching, while 3UG4512-1BR20 combines sequence and phase-failure supervision. 3UG4513-1BR20 extends voltage window monitoring (160 … 690 V) for generators with wide frequency ranges. All variants share identical terminal layout, IP20 rating and certification package, enabling one-size panel cut-outs and unified wiring practices across motor-control, genset and UPS applications .
Our Competitive Advantages
As a dedicated Industrial Automation trader, we provide exceptional procurement flexibility and customer-centric service solutions. Our adaptable payment structures accommodate wire transfer arrangements and customized credit facilities for approved partners, removing financial barriers to urgent maintenance requirements. We maintain significant strategic inventory in regional distribution hubs, enabling delivery within 5-7 business days to most industrial centers worldwide. Our extensive sourcing network spans premium European and Asian sensor distribution channels, ensuring authentic Telemecanique component traceability without geographic restrictions. This multi-channel approach guarantees availability during global supply chain disruptions. Our application engineers provide sensor selection consultation, detection distance calculation, and integration support, assisting with control logic configuration and wiring optimization. Through direct manufacturer partnerships and streamlined logistics, we deliver genuine Telemecanique inductive sensors with accelerated fulfillment cycles and competitive pricing structures.
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About Us
We are a focused industrial-automation components trader committed to delivering authentic Siemens monitoring solutions with speed, flexibility and technical expertise.