US10D1050A IMO 10kA UL1077 MCB 1 pole 50A D Curve

US10D1050A IMO 10kA UL1077 MCB 1 pole 50A D Curve

SKU: US10D1050AMPN: US10D1050A
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Why Choose the IMO US10D1050A Miniature Circuit Breaker?

The IMO US10D1050A is a high-performance UL1077 supplementary miniature circuit breaker (MCB) designed to provide dependable overload and short-circuit protection for industrial control panels, OEM machinery and factory automation systems. Manufactured by IMO Precision Controls, this single-pole breaker combines reliable thermo-magnetic protection with a compact DIN rail mounted design, making it ideal for demanding industrial applications.

Designed for machine builders, panel builders and automation engineers, the US10D1050A integrates seamlessly with PLCs, relays, contactors, industrial power supplies and other control equipment. Its compact modular construction helps maximise enclosure space whilst delivering dependable supplementary circuit protection.

Featuring a 50 A rated current, a D Curve tripping characteristic and a 10 kA short-circuit breaking capacity, the IMO US10D1050A is particularly suitable for transformers, solenoids, contactor coils and other inductive loads that generate high inrush currents during energisation.

Key Advantages

  • Compact UL1077 supplementary miniature circuit breaker.
  • 50 A rated current for industrial control applications.
  • D Curve characteristic for high inrush current loads.
  • 10 kA short-circuit breaking capacity.
  • Single-pole construction saves valuable DIN rail space.
  • Thermo-magnetic protection against overloads and short circuits.
  • Fast DIN rail installation for new and retrofit control panels.

Key Features

  • IMO Precision Controls US10D Series.
  • Single-pole configuration.
  • 50 A rated operational current.
  • D Curve magnetic trip characteristic.
  • 10 kA interrupting capacity.
  • UL1077 supplementary protector.
  • Thermo-magnetic operating mechanism.
  • Positive contact position indicator.
  • Compact EN 60715 DIN rail mounted design.

Reliable Protection for Industrial Automation

The IMO US10D1050A automatically disconnects circuits experiencing overload or short-circuit conditions, helping to protect electrical conductors, machinery and sensitive industrial equipment from damage. Its dependable thermo-magnetic operating mechanism contributes to improved reliability and reduced production downtime.

The D Curve characteristic is specifically intended for circuits with high instantaneous starting currents. This makes the breaker an excellent choice for transformer-fed circuits, industrial power supplies, solenoids, contactor coils and other inductive equipment where nuisance tripping must be minimised.

Typical Applications

  • Industrial control panels.
  • OEM machinery.
  • Factory automation systems.
  • Transformer protection.
  • Industrial power supplies.
  • Contactor and relay circuits.
  • PLC control systems.
  • Material handling and process control equipment.
  • Packaging machinery.

Technical Specifications

Current 50 A
Phase Single Phase
Manufacturer IMO Precision Controls
Series US10D
Model US10D1050A
Product type Supplementary miniature circuit breaker
Rated current 50 A
Number of poles 1
Trip characteristic D Curve (10–20 × In)
Breaking capacity 10 kA
Standards UL1077, IEC 60947-2 & IEC 60898-1
UL rated operational voltage 277 V AC
IEC rated operational voltage 230 V AC
DC rated operational voltage 48 V DC
Frequency 50 / 60 Hz
Protection rating IP20 / NEMA 1
Mounting EN 60715 DIN rail
Operating temperature -25°C to +55°C
Mechanical life 20,000 operations
Electrical life 6,000 operations
Terminal tightening torque 2.5 Nm
Conductor capacity AWG 18–3 (0.82–26.7 mm²)
Manufacturer part number US10D1050A
Barcode 5056207471209
HS Code 8536201090
Country of Manufacture India
Poles 1-pole
Device Type MCB
Trip Curve D curve
Breaking Capacity 10 kA

Frequently Asked Questions

What is the IMO US10D1050A used for?

It provides supplementary overload and short-circuit protection for industrial control systems, machinery and factory automation equipment.

What is the rated current?

The IMO US10D1050A has a rated current of 50 A.

Why choose a D Curve circuit breaker?

D Curve breakers are designed for inductive loads with high inrush currents, including transformers, industrial power supplies, solenoids and contactor coils.

What is the interrupting capacity?

The US10D1050A provides a 10 kA short-circuit breaking capacity.

Is this a UL489 branch circuit breaker?

No. The US10D1050A is a UL1077 supplementary protector intended for supplementary protection within industrial equipment and control systems.

How is the breaker installed?

The breaker clips directly onto a standard EN 60715 DIN rail inside industrial control panels and electrical enclosures.

Trusted by Industrial Professionals

IMO Precision Controls supplementary circuit breakers are trusted worldwide by OEM manufacturers, panel builders and automation engineers for compact, dependable protection of industrial electrical control systems.

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