OT16G1-4BSN2 ABB OT Plus Isolator 16A 4 Pole. G1 Frame Size. Screw Terminals IP20 1SCA163375R1001

The OT16G1-4BSN2 is ABB's 16A 4-pole isolator switch disconnector from the OT Plus range, featuring G1 frame size construction with screw terminals and IP20 protection rating. This compact industrial switching device provides reliable electrical isolation for control circuits, motor applications, and distribution panels where safe disconnection is essential. The OT Plus series represents ABB's latest generation of isolators, offering enhanced functionality and compatibility compared to previous OT ranges.

Key Features

• Adjustable Fourth-Pole Timing: Allows two different time offsets within the same switch - simultaneous or early-make/late-break operation - providing flexibility for complex switching sequences and enhanced safety in motor control applications.
• Padlockable Direct Mounted Handle: Integrated locking mechanism enables LOTO (Lock Out Tag Out) procedures for maintenance safety, while maintaining full compatibility with existing OT shaft systems and external handle accessories.
• Dual Mounting Options: Base and DIN rail mounting capability provides installation flexibility for panel builders and installers, accommodating different enclosure designs and space constraints.
• Generous Cable Capacity: Accepts flexible copper cables from 0.75mm² to 16mm² and solid copper cables up to 6mm², covering most industrial and commercial wiring requirements without additional terminals.
• Compact G1 Frame: At just 46mm wide, this space-efficient design maximizes panel real estate while maintaining full 16A current rating and robust switching performance.
• 7.5kW AC-23A Rating: Handles motor loads up to 7.5kW under AC-23A utilization category, making it suitable for direct motor control and heavy industrial switching duties.

Applications

The OT16G1-4BSN2 isolator is designed for industrial control panels, motor control centres, and distribution boards where reliable 4-pole isolation is required. Common applications include motor starter isolation, control circuit switching, emergency stops, and maintenance disconnection in manufacturing equipment. The adjustable fourth-pole timing makes it particularly suitable for applications requiring auxiliary contact sequencing, such as motor control circuits with safety interlocks or signalling requirements.

Standards and Sustainability

This isolator complies with IEC 60947-3 international standards for switch-disconnectors and UL 60947-4-1 certification for North American markets. The IP20 protection rating ensures safe operation in standard electrical enclosures, preventing accidental contact with live parts while allowing adequate ventilation. The robust construction and precise 1Nm terminal tightening torque specification ensure long-term reliability and minimal maintenance requirements.

Manufactured by ABB in Finland, order code OT16G1-4BSN2 (alternate reference 1SCA163375R1001).

Frequently Asked Questions

What cable sizes can be connected to the OT16G1-4BSN2 isolator?

The isolator accepts flexible copper cables from 0.75mm² to 16mm² and solid copper cables from 0.75mm² to 6mm². The screw terminals should be tightened to 1Nm torque for secure connection. This range covers most industrial applications from control wiring up to 16A power circuits.

How does the adjustable fourth-pole timing work and when would I use it?

The adjustable fourth-pole allows you to configure whether the auxiliary contacts operate simultaneously with the main contacts or with early-make/late-break timing. This is valuable in motor control applications where you need auxiliary contacts to operate safety circuits, signalling, or interlocks before or after the main power contacts switch.

What are the mounting dimensions and will it fit in my existing panel?

The isolator measures 68mm high × 46mm wide × 62mm deep, making it very compact for a 4-pole 16A device. It can be mounted on DIN rail or base-mounted directly to the panel. The narrow 46mm width helps maximize space utilization in crowded control panels.

Is this isolator compatible with existing OT series accessories?

Yes, the OT Plus range maintains full compatibility with existing OT shaft systems and external handles. The padlockable direct mounted handle can be used alongside or replaced with external operating mechanisms from the OT accessory range, providing upgrade flexibility.

What's the difference between this G1 frame and larger frame sizes?

The G1 frame is the smallest in the OT Plus range, designed for 16A applications with maximum compactness. While maintaining the same advanced features like adjustable fourth-pole timing, it offers space savings compared to larger frames used for higher current ratings, making it ideal where panel space is limited.

Where can I buy the ABB OT16G1-4BSN2 switch?

You can buy the ABB OT16G1-4BSN2 OT Plus Switch at CSE Distributors in the UK. As an official ABB distributor with over 50 years of experience, CSE provides genuine ABB products with full warranty support and has earned hundreds of positive customer reviews for their technical expertise and reliable service.