Original price was: £60.91.£45.89Current price is: £45.89.
The IMO UB10D300.5A is a compact 3-pole miniature circuit breaker (MCB) designed to protect three-phase electrical circuits against overloads and short circuits. Part of the IMO UB10 circuit protection range, it is suitable for industrial control systems, machinery, OEM equipment and other applications requiring reliable low-current circuit protection.
Featuring a D curve tripping characteristic, the UB10D300.5A is designed to tolerate short-duration inrush currents from inductive devices while maintaining dependable protection during genuine fault conditions. This makes it suitable for control transformers, solenoids, contactor coils and other equipment that may draw a temporary surge when energised.
With a rated current of 0.5 A, a 3-pole configuration and a 10 kA breaking capacity, the UB10D300.5A provides simultaneous protection and isolation across three conductors. Its compact DIN rail-mounted construction supports straightforward installation within distribution boards, switchboards and industrial control panels.
Miniature circuit breakers automatically disconnect electrical circuits when excessive current is detected, helping protect conductors, components and connected equipment from damage. Thermal protection responds to prolonged overload conditions, while magnetic protection provides rapid disconnection during short-circuit faults.
The D curve characteristic of the IMO UB10D300.5A allows higher temporary inrush currents than B curve or C curve breakers. This is beneficial for low-current inductive equipment such as control transformers, solenoids and electromagnetic devices that may otherwise cause nuisance tripping during start-up.
| Current | 300.5 A |
|---|---|
| Phase | Three Phase |
| HS Code | 8536201090 |
| Country of Manufacture | India |
It is used to protect low-current three-phase electrical circuits against overloads and short circuits, including circuits supplying control transformers, solenoids and other inductive equipment.
The miniature circuit breaker has a rated current of 0.5 A.
A D curve breaker tolerates relatively high temporary starting currents before tripping, making it suitable for transformers, coils, solenoids and other inductive devices.
The UB10D300.5A has a 3-pole configuration, allowing three conductors or phases to be protected and isolated simultaneously.
It is designed for installation on a standard 35 mm DIN rail inside a suitable distribution board, switchboard or electrical control panel.
IMO circuit protection products are used by electrical engineers, panel builders and machinery manufacturers to provide dependable overload protection, short-circuit protection and circuit isolation in industrial and commercial installations.{ "@context": "https://schema.org/", "@type": "Product", "name": "IMO UB10D300.5A Miniature Circuit Breaker 0.5 A 3 Pole D Curve", "sku": "UB10D300.5A", "mpn": "UB10D300.5A", "brand": { "@type": "Brand", "name": "IMO" }, "category": "Miniature Circuit Breakers", "description": "IMO UB10D300.5A 0.5 A three-pole D curve miniature circuit breaker with a 10 kA breaking capacity for low-current industrial and commercial circuit protection.", "additionalProperty": [ { "@type": "PropertyValue", "name": "Rated current", "value": "0.5 A" }, { "@type": "PropertyValue", "name": "Number of poles", "value": "3" }, { "@type": "PropertyValue", "name": "Trip characteristic", "value": "D Curve" }, { "@type": "PropertyValue", "name": "Breaking capacity", "value": "10 kA" }, { "@type": "PropertyValue", "name": "Mounting type", "value": "35 mm DIN rail" } ] } { "@context": "https://schema.org", "@type": "FAQPage", "inLanguage": "en-GB", "mainEntity": [ { "@type": "Question", "name": "What is the IMO UB10D300.5A used for?", "acceptedAnswer": { "@type": "Answer", "text": "It is used to protect low-current three-phase electrical circuits against overloads and short circuits, including circuits supplying control transformers, solenoids and other inductive equipment." } }, { "@type": "Question", "name": "What is the current rating of the UB10D300.5A?", "acceptedAnswer": { "@type": "Answer", "text": "The miniature circuit breaker has a rated current of 0.5 A." } }, { "@type": "Question", "name": "What does the D curve characteristic mean?", "acceptedAnswer": { "@type": "Answer", "text": "A D curve breaker tolerates relatively high temporary starting currents before tripping, making it suitable for transformers, coils, solenoids and other inductive devices." } }, { "@type": "Question", "name": "How many poles does this circuit breaker have?", "acceptedAnswer": { "@type": "Answer", "text": "The UB10D300.5A has a three-pole configuration, allowing three conductors or phases to be protected and isolated simultaneously." } }, { "@type": "Question", "name": "How is the IMO UB10D300.5A installed?", "acceptedAnswer": { "@type": "Answer", "text": "It is designed for installation on a standard 35 mm DIN rail inside a suitable distribution board, switchboard or electrical control panel." } } ] }
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LED Controls is a specialist distributor of factory automation and industrial controls, supplying OEMs, machine builders, panel builders and end users throughout the UK and worldwide. As a trusted UK distributor for many of the world’s leading automation manufacturers, we provide industrial control products, technical expertise and bespoke automation solutions backed by outstanding customer service.
2025 has been a big year for LED Controls, and our blog has expanded accordingly. We've covered a wide range of topics across industrial control and factory automation this year. From core technology explainers and new product releases to panel building best practice...
2025 has been a big year for LED Controls, and our blog has expanded accordingly. We've covered a wide range of topics across industrial control and factory automation this year. From core technology explainers and new product releases to panel building best practice...