OTPL125FD ABB Fourth Pole for OT100–125FT3 Switch Disconnectors

Why Choose the ABB OTPL125FD Fourth Pole for OT100–125FT3 Switch Disconnectors?

The ABB OTPL125FD, order code 1SCA105088R1001, is a dedicated fourth-pole accessory for ABB OT100–125FT3 door-mounted switch disconnectors. It is designed to extend a compatible 3-pole switch with an additional switched pole, providing a practical solution for applications where a fourth conductor must be controlled together with the main switch.

Unlike a simultaneous fourth pole, the OTPL125FD incorporates a late-break and early-make function. This creates a deliberate timing difference between the three main contacts and the additional pole: the fourth pole makes before the main poles during closing and breaks after the main poles during opening. This operating sequence is particularly useful where the fourth pole is employed for neutral switching.

The OTPL125FD is side mounted directly onto compatible ABB OT100FT3 through OT125FT3 switch disconnectors. Its purpose-designed construction ensures mechanical coordination with the main switch mechanism, providing an integrated four-pole switching arrangement without requiring replacement of the complete switch disconnector.

Key Advantages

• Adds a fourth switched pole to compatible ABB OT100–125FT3 switch disconnectors.
• Late-break and early-make operation provides sequenced switching relative to the main contacts.
• Particularly suitable for applications requiring controlled neutral-pole switching.
• Designed specifically for ABB OT100FT3–OT125FT3 door-mounted switches.
• Side-mounted construction integrates directly with the compatible switch frame.
• Mechanically operated together with the main switch disconnector.
• Provides a straightforward way to convert a compatible 3-pole arrangement to a four-pole switching configuration.
• Genuine ABB OT switch-disconnector accessory for correct mechanical compatibility.

Key Features

• ABB OTPL fourth-pole accessory series.
• Designed as the 4th pole for OT100–125FT3.
• Compatible with ABB OT100FT3 through OT125FT3 door-mounted switch disconnectors.
• Late-break function when opening the switch.
• Early-make function when closing the switch.
• Intentional timing difference between the main contacts and fourth pole.
• Mountable on the side of the switch.
• Operates mechanically with the main switch mechanism.
• Designed for door-mounted ABB OT switch-disconnector configurations.
• Compact accessory construction.
• Approximate unit weight of 0.14 kg.
• Supplied as one fourth-pole accessory per unit.

How Does the Late-Break and Early-Make Fourth Pole Work?

The ABB OTPL125FD does not switch at exactly the same instant as the three main poles. During closing, the fourth pole uses an early-make action so its contact closes before the main contacts. During opening, its late-break action keeps the fourth pole connected until after the main contacts have opened.

This sequenced operation is useful in installations where the additional pole is used as a switched neutral. Maintaining the fourth-pole connection during the transition helps provide an appropriate switching sequence between the neutral conductor and the main phase conductors. The OTPL125FD is specifically engineered to provide this function on compatible ABB OT100–125FT3 door-mounted switch disconnectors.

Typical Applications

• Adding a fourth pole to compatible ABB OT100–125FT3 switch disconnectors.
• Switched-neutral applications.
• Three-phase and neutral electrical distribution systems.
• Industrial low-voltage switchboards.
• Commercial electrical distribution panels.
• Machinery and equipment isolation systems.
• OEM control and distribution panels.
• Installations requiring late-break and early-make fourth-pole operation.