Injection Moulding Machine for MCB Housings
MCB housings are made on horizontal injection moulding machines, in multi-cavity case and cover moulds, from glass-filled PA66 or PBT, with DMC or BMC thermoset for higher breaking capacities. Cavity count and mould size set the machine. The arc chamber matters most: case and cover must mate with no flash inside the arc path.
Machine selection for MCB parts focuses on tight shot control for stable pocket dimensions and wear protection against glass fibre. Pratishna Engineers supplies horizontal injection moulding machines for thermoplastic MCB housings, builds special purpose machines to application for thermoset versions, and can recommend a configuration.
Moulding MCB Housings?
Share the case and cover drawings, grade, pole count and cavity plan, and Pratishna Engineers will advise on the machine.
Machine Requirements for MCB Housing Moulding
An MCB case holds the trip mechanism and contains the arc, so dimensions inside the case count more than the outside. Check for:
- Flash-free parting line along the arc chamber
- Stable mechanism pockets so case and cover mate cleanly
- Wear-resistant screw and barrel for glass-filled PA66 and PBT
- Drying of nylon and PBT to stop splay and brittle parts
- Moisture conditioning of nylon parts before gauging
- Cool, balanced moulds so thin case walls do not warp
Recommended Machine for MCB Housings
Single-pole cases, covers and handles in multi-cavity moulds sit on the E Series (75-180 T). Multi-pole cases and larger family moulds move to the C Series (140-320 T) or H Series (120-350 T). DMC and BMC housings need a thermoset machine with a stuffer feed, built to application as a special purpose machine.
Not Sure Which Machine You Need?
Send your MCB case and cover details for a machine suggestion.
Why Choose Pratishna Engineers?
- Application-Based Machine Selection
- In-House Engineering & Manufacturing
- Multiple Machine Series
- Production-Focused Solutions
- End-to-End Technical Support
- Industry-Specific Solutions
- Machine Lifecycle Support
Injection Moulding Machine Buyer Resources
Download practical resources to help you select, size and specify the right machine.
Horizontal Injection Moulding Machine Selection Guide
A step-by-step guide covering the key inputs needed to select the right machine: product weight, projected area, number of cavities, plastic material, required clamping force, shot / injection capacity, mould dimensions, production quantity, cycle time and automation requirement.
Download PDFPDF · 265 KB
How to Calculate Clamping Force for an Injection Moulding Machine
A clear methodology that explains how clamping force is calculated, covering projected area, injection pressure, safety factor, number of cavities and material considerations.
Download PDFPDF · 363 KBElectrical & Electronics Components & Machine Guide
A guide to Electrical & Electronics components, covering switches, sockets, MCB and RCCB housings, plug tops, meter boxes, solar connectors and electronic housings. It explains flame-retardant and glass-filled grades, thermoset parts, dimensional control, and how to match each part to a suitable machine.
Download PDFPDF · 202 KB
FAQs / Buyer Questions
Questions breaker makers ask before they commit to case tooling.
Which Injection Moulding Machine Is Used to Make MCB Housings?
For glass-filled nylon or PBT cases, the E Series covers single-pole tools and the C or H Series covers multi-pole cases and family moulds. Thermoset DMC cases need a special purpose machine with stuffer feed, built to application.When Is DMC Used Instead of Glass-Filled Nylon?
Thermoset DMC or BMC is chosen as breaking capacity rises, because it does not soften or drip near the arc. FR PA66 is common for handles and lower-rated breakers, where it moulds faster and allows regrind.Why Do Nylon MCB Cases Change Size After Moulding?
PA66 takes up moisture after moulding and grows slightly. Parts measured straight off the press can read undersize later, so cases are conditioned before gauging and mould dimensions are set against conditioned parts.
How Is Flash Kept Out of the Arc Chamber?
A well-fitted parting line, vents placed away from the arc path, and a clamp with margin over the projected area keep flash out. Worn shut-offs are the usual cause, so mould maintenance is planned.Can Pratishna Recommend a Machine for My MCB Housing?
Yes. Share the case and cover drawings or samples, grade, part weights, mould size, cavity count and monthly output, and Pratishna Engineers will recommend a suitable machine.Does the Machine Suit Other Circuit Protection Parts Too?
Yes, subject to the mould. Similar machines run RCCB housings, circuit protection parts such as trip levers and terminal covers, and contactor or relay housings.
Technical Disclaimer
Disclaimer: The information provided in this webpage is for general informational and educational purposes only. It is based on technical references and industry information available at the time of preparation and may be subject to change. It does not constitute engineering, technical, commercial or professional advice, nor does it constitute a quotation, specification, warranty or contractual commitment by Pratishna Engineers.
Actual injection moulding machine and process requirements vary according to the component design, material, mould, production volume, machine configuration and operating conditions. The information, examples, calculations and recommendations provided should be independently evaluated and verified for the specific application before making any equipment, process or production decision. Information obtained from third-party sources remains subject to the accuracy and limitations of those sources.
Limitation of Liability: Pratishna Engineers makes no representation or warranty, express or implied, regarding the completeness, accuracy or suitability of the information for any particular application. To the extent permitted by applicable law, Pratishna Engineers shall not be liable for any loss, damage, cost or consequence arising from reliance on or use of the information contained in this webpage. Final machine selection, configuration and application suitability should be confirmed with Pratishna Engineers based on complete and accurate project requirements.
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Planning a New Injection Moulding Project?
Share your component, material, mould and production target. Our engineering team will help you identify the right machine configuration.
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