Technology guides

Information and guides on the technology behind the types of auto-electrical, warning and safety products available from the Dun-Bri Group…

Fire Extinguisher classification codes (BS EN 3)

According to the European standard BS EN 3, fire extinguishers in the United Kingdom as all throughout Europe are red RAL 3000.  They then feature a band or circle of a second colour covering between 5–10% of the surface area of the extinguisher indicates the contents. Before 1997, under the old British Standard, the entire […]

Fuses vs. circuit breakers – what’s the difference?

Fuses and circuit breakers are designed to interrupt the power to a circuit when the current flow exceeds safe levels.  For example, if your toaster shorts out, a fuse or breaker should “trip”, protecting the wiring in the walls from melting.  As such, fuses and breakers are primarily intended to protect the wiring — UL […]

IP ratings – what exactly do they mean?

The IP rating, or International Protection Marking as it technically known is part of the IEC standard 60529.  It is sometimes interpreted as Ingress Protection Marking, but its job is to classify and rate the degree of protection provided against intrusion (body parts such as hands and fingers), dust, accidental contact, and water by mechanical casings and electrical […]

HID xenon bulbs – D2S or D2R – what’s the difference?

When looking at D2 xenon HID bulbs, it can be tricky to determine which bulb you need.  A frequently asked question in our Sales Office is, ‘do I need a D2S, D2C, or D2R?’… The difference between D2S and D2R is that D2S HID bulbs are designed to be used in a projector headlight application, […]

PIR technology in interior lighting – the basics

Nowadays, most people often want to source PIR activated LED interior lighting or LED sensors to integrate it into an existing circuit when buying from Dun-Bri.  This article aims to give you a greater understanding of what PIR means, and what it actually is… So, what does PIR stand for? PIR stands for Passive Infra-Red. […]

Vehicle Bulb identification sheets

To help you identify the most commonly fitted bulbs in cars, vans, motorcycles, trucks, buses and other plant and agricultural machinery, you can now download the Vehicle Bulb identification sheets.  For more help and advice, please call us on 01763 274185 or email with your enquiry.           To download the identification sheets […]

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