VSP D2 Single Phase Preventor

• Model: VSP D2
• Type: Single Phase Preventer (SPP) / Motor Protection Relay
• Function: Detects single-phasing, phase reversal, voltage imbalance, and under/over voltage on 3-phase supply
• Supply Voltage: 3-phase, 415V AC (typical)
• Output: Relay contact to trip contactor/starter coil
• Response Time: Fast trip on phase failure (typically within seconds)
• Mounting: DIN rail or panel mounting
• Reset: Auto-reset once supply is restored to normal (model-dependent)

What is this product?

The VSP D2 is a protection device that continuously monitors 3-phase electrical supply and automatically disconnects the load if it detects single-phasing, phase reversal, or abnormal voltage conditions. It's installed ahead of motor starters to prevent motor burnout from unbalanced or missing phase supply.

Where is it used?

• 3-phase motor starter panels for pumps, compressors, and blowers
• Submersible and agricultural pump control panels
• Industrial machinery panels with 3-phase motor loads
• HVAC compressor control circuits
• Water treatment and pumping station motor protection

Key technical advantages

The VSP D2 stands out because it protects motors from one of the most common and destructive electrical faults in Indian industrial and agricultural supply — single phasing, which can silently damage motor windings within minutes if left undetected. Unlike thermal overload relays alone, this device catches the fault at the supply level before winding current even rises to dangerous levels, offering faster and more reliable protection. It also typically detects phase reversal, which prevents motors and pumps from running backward and causing mechanical damage — a particularly valuable feature for submersible pump applications where reverse rotation can damage the pump assembly. Its auto-reset function (where equipped) means the panel resumes normal operation automatically once supply stabilizes, reducing manual intervention and downtime for unattended installations like remote pump houses.

Why buy from Voltkart?

Voltkart is an authorized dealer for VSP, so the D2 Single Phase Preventor you receive is 100% genuine with full manufacturer warranty — not a counterfeit or grey-market unit. Every order comes with a proper GST invoice, PAN India delivery with fast dispatch from our Delhi (Bhagirath Palace) warehouse, and direct WhatsApp support (+91 98996 68881 / 8800754881) for help with wiring guidance, panel integration, or bulk order pricing.

FAQs

Q: Does the VSP D2 protect against voltage fluctuation, or only complete phase loss?
A: The VSP D2 typically monitors for a combination of single-phasing, phase reversal, and voltage imbalance/under-over voltage conditions, not just complete phase failure — this gives broader protection than a basic single-phase-only preventer, safeguarding your motor from multiple common supply faults.

Q: Does the motor restart automatically once the phase supply is restored, or does it need manual reset?
A: This depends on the specific VSP D2 variant — some models auto-reset once supply returns to normal, while others require manual reset for safety in unattended applications. Let us know your application (attended panel vs remote pump house) and we can confirm which behavior your unit has.

Q: Can the VSP D2 be retrofitted into an existing motor starter panel?
A: Yes, the VSP D2 is designed for straightforward retrofitting into existing 3-phase starter panels — it's wired ahead of the contactor coil circuit so it trips the starter on fault detection, and we can guide you through the wiring if you share your existing panel layout.

Related Products & Collections

Also explore our complete range of Protection Relays, Phase Failure Relays, Phase Sequence Relays, and Motor Protection Devices for enhanced electrical safety.

For complete automation panel solutions, browse our collections of PLCs, Timers, Temperature Controllers, AC Drives, and SELEC automation products. You may also be interested in our range of Power Supply solutions including DIN Mounted SMPS, Enclosed SMPS, 1 Phase SMPS, 3 Phase SMPS, and popular Mean Well MDR Series, NDR Series, EDR Series, and TDR Series power supplies for industrial applications.