Why order circuit breakers online from Communica
Get the right circuit protection for projects, workshops and production without waiting weeks for imports. We prioritise availability, clear specifications and practical pairing advice so students, technicians, engineers and procurement teams in South Africa can replace, prototype or spec systems with confidence. Local stock in Samrand, Pretoria and Cape Town reduces lead times and lets you collect the same day in many cases.
What we stock and who it's for
From miniature circuit breakers (MCBs) used in control panels to moulded case circuit breakers (MCCBs) and motor protection breakers, our ranges cover common installation and prototype needs. Popular brands and categories you can explore include the main Collections and the full category index for in-depth browsing.
Check branch inventory and opening times before you travel: Branches & Trading Hours provides live pickup options.
Practical selection: the three questions to answer first
- What continuous current must the breaker carry? (nameplate and load calculations)
- What breaking capacity and voltage rating does your supply require?
- Is short-circuit or motor starting protection needed (thermal-magnetic vs electronic)?
For hands-on help and typical specs for educational labs and small workshops, see our About page to understand Communica’s service model and support for educational users: About Us.
Quick spec comparison
Use this reference table to narrow choices before you compare datasheets:
| Type | Typical use | Rating range | Notes |
|---|---|---|---|
| MCB (B/C curve) | Lighting, sockets, small panels | 1-63 A | Fast trip for overloads, select curve by inrush |
| MCCB | Main feeders, larger loads | 100 A-2500 A | Adjustable trip, higher breaking capacity |
| RCBO | Combined residual-current & overcurrent | 6-63 A | Good for circuits requiring earth-leakage protection |
Specification callouts to verify
Always confirm: rated current (In), rated voltage (Ue), breaking capacity (kA), trip curve (B/C/D), pole count and mounting type (DIN-rail vs busbar). Compare product datasheets in our Collections listing for brand cross-reference: Shop by Category.
Simple wiring ASCII for a single-phase MCB
Below is a clear schematic for line/load wiring in a typical consumer circuit:
Supply L -----[ MCB ]----- Load L Supply N ------------------ Load N (Earth direct to chassis/earth bar)
