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Havells STADx DP 40A

The Havells STADx DP 40A is a high-performance 2-Pole manual switch disconnector designed for reliable circuit isolation in residential and commercial settings. Rated for 40A at 415V, this unit belongs to the specialized STADx series, utilizing high-grade thermoplastic housing and a robust AC-23A utilization category. It provides a safe, physical disconnect for 1-phase + Neutral configurations, ensuring that downstream maintenance can be performed with absolute electrical certainty.

Quick Answer

This 40A Switch Disconnector is used as a primary manual isolator for single-phase circuits, allowing users to safely cut power to both Phase and Neutral lines simultaneously before maintenance.

✓40A Rated Current for high-capacity sub-circuit control
✓2-Pole (1P+N) configuration for simultaneous Phase and Neutral isolation
✓AC-23A Utilization Category suitable for switching highly inductive loads
✓Robust Thermoplastic housing with IP40 ingress protection
✓Standard DIN Rail mounting for seamless distribution board integration

Choose the Havells STADx DP 40A if you need a dedicated, heavy-duty manual isolator for a 40A circuit that can handle inductive loads (like motors) and requires simultaneous Neutral disconnection for safety.

✓ Who Should Buy

  • •Electricians installing main sub-panels for single-phase residential units
  • •Facility managers requiring a reliable 40A manual disconnect for industrial equipment
  • •Homeowners upgrading to modular DIN-rail distribution boards who prioritize safety

✕ Who Should Avoid

  • •Users looking for a device that provides automatic short-circuit or overload protection (an MCB is required for that)
  • •Applications exceeding 40A current requirements where a higher-rated isolator is necessary
Product Overview
The Havells STADx DP 40A stands as a critical component in modern modular electrical systems. Unlike standard MCBs that focus on automatic fault detection, the STADx disconnector is engineered specifically for manual control and isolation. Its 2-pole architecture ensures that when the toggle is switched off, the entire circuit—including the neutral—is physically separated from the source, eliminating the risk of 'back-feeding' or neutral shocks during repair work. Built with the Indian electrical climate in mind, the STADx series features a 415V rating to handle voltage fluctuations and a thermoplastic body that offers excellent heat resistance. Its compact DIN-rail design allows it to fit perfectly alongside other modular devices in a standard distribution board, making it the preferred choice for main incoming lines in 40A rated residential panels.

BrandHavells
Model NameSTADx DP 40A
TypeMain Switch Disconnector
SeriesSTADx Series
Housing MaterialThermoplastic
Country Of OriginIndia
Release Year2015

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Engineering Analysis
The engineering core of the STADx DP 40A lies in its high-conductivity screw terminals and silver-alloy contact points. These components are optimized to reduce contact resistance, thereby minimizing heat generation even under a constant 40A load. The 2nd pole (Neutral) is specifically timed to ensure it closes slightly before or with the Phase pole, maintaining circuit stability. While the unit does not include thermal-magnetic overload protection, its mechanical endurance is tested for thousands of operations, ensuring it won't fail as a primary point of isolation over years of use.

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