ABB 1SDA066768R1 A1N 125 TMF 125-1250 4p F F 4-Pole 125A Fixed Moulded Case Circuit Breaker for Transformer Generator Installation Protection

The ABB A1N 125 TMF 125-1250 4p F F (SKU: 1SDA066768R1) is a 4-pole, 125 A fixed-mount power circuit breaker from the Formula A1 series, engineered for reliable protection of transformers, generators, and electrical installations. Designed to IEC standards, this breaker delivers robust overcurrent and short-circuit protection in demanding industrial and commercial environments, fitting neatly into control panels with its compact 101.6 × 130 × 60 mm footprint.

Technical Specifications

Certifications & Standards

• CE: Conforms to European Union safety, health, and environmental protection requirements
• IEC: Designed and tested in accordance with relevant IEC standards for power circuit breakers
• RoHS: Compliant with EU Restriction of Hazardous Substances Directive
• REACH: Compliant with EU REACH regulation on chemical substances
• EU Directive 2011/65/EU: Meets the EU RoHS recast directive for electrical and electronic equipment
• TSCA: Compliant with the US Toxic Substances Control Act
• WEEE: Registered under the EU Waste Electrical and Electronic Equipment Directive for responsible end-of-life disposal

Applications & Use Cases

• Transformer secondary-side overcurrent and short-circuit protection in industrial switchboards
• Generator output protection for standby and prime power installations
• Main and sub-distribution board protection in commercial and industrial buildings
• Installation protection in motor control centres and process automation panels
• Wherever a compact, fixed 4-pole 125 A IEC-rated power circuit breaker is required

Frequently Asked Questions

What does the catalog number A1N 125 TMF 125-1250 4p F F mean?

A1N denotes the Formula A1 series and N performance level; 125 is the frame rating in amperes; TMF indicates a thermal-magnetic fixed trip unit with a rated current setting range of 125–1250 A; 4p means 4 poles; F F designates a fixed (non-withdrawable) front-fixed mounting.

What is the SKU / order reference for this breaker?

The ABB internal order reference (SKU) is 1SDA066768R1. The customer-facing catalog number printed on datasheets and BOMs is A1N 125 TMF 125-1250 4p F F.

Is this breaker suitable for transformer protection?

Yes. The A1N 125 TMF 125-1250 4p F F is specifically classified as a power circuit breaker for transformer, generator, and installation protection (ABB product type o228).

What are the panel cutout dimensions?

The unit measures 101.6 mm (W) × 130 mm (H) × 60 mm (D) and weighs 1 kg, making it suitable for space-constrained switchboard designs.