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The Lauritz Knudsen SM301 Single Phasing Preventor is a reliable supply monitoring relay designed to protect three-phase motors and equipment from electrical supply faults. It continuously monitors phase conditions and disconnects the load in case of single phasing or severe voltage imbalance, helping prevent motor overheating, breakdowns, and costly downtime.Operating across a wide voltage range of 65–415V AC, the SM301 is suitable for 3-phase, 3-wire systems commonly used in industrial and commercial installations. The built-in fail-safe design ensures that the output relay de-energizes during fault or supply failure, providing dependable protection. A 2-second ON delay prevents nuisance tripping during startup, while the 7-second OFF delay avoids unnecessary shutdowns due to brief voltage fluctuations.With 65V asymmetry sensitivity and 1 changeover (C/O) contact, the SM301 easily integrates with contactors and control circuits. It is widely used in motor protection panels, pump control panels, compressors, HVAC systems, and industrial machinery, where consistent three-phase supply is critical for safe operation.Buy Lauritz Knudsen SM301 Single Phasing Preventor online from Maheshwari Distributors – Genuine protection relay, compact design, and pan-India delivery.
Returns will be accepted for up to 10 days of Customer’s receipt or tracking number on unworn items. You, as a Customer, are obliged to inform us via email before you return the item, only in the case of:
– Received the wrong item.
– Item arrived not as expected (ie. damaged packaging).
– Item had defects.
– Over delivery time.
– The shipper does not allow the goods to be inspected before payment.
The returned product(s) must be in the original packaging, safety wrapped, undamaged and unworn. This means that the item(s) must be safely packed in a carton box for protection during transport, possibly the same carton used to ship to you as a customer.
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