Which circuit-protection types does Bule currently list?
Bule Electrical Materials lists 14 of the 36 device types below: 1P and 3P MCB; 2P and 4P RCCB; 3P MCCB; fixed-type ACB; 2P and 4P main isolators; 3P/4P switch disconnectors; MPCB; phase monitoring relay; voltage protection relay; earth leakage relay; and auxiliary/alarm contacts. Model numbers and live stock need confirmation.
The other 22 types are included for technical reference. The listings below distinguish Bule’s confirmed range from products covered for comparison.
How to specify protection equipment
Start with system voltage, pole arrangement, current rating, expected fault level, required protective function, equipment standards and upstream/downstream coordination. Residual-current protection is not a substitute for correctly selected overcurrent protection. Solar DC protection requires devices explicitly rated for direct-current duty.
Miniature Circuit Breakers
1. MCB Single Pole (1P)
Single-pole miniature circuit breaker used for overcurrent protection of an appropriately designed single-phase final circuit. Specify current rating, tripping curve and breaking capacity.
Bule product range
2. MCB Double Pole (2P)
Two-pole miniature circuit breaker for applications requiring linked switching or protection of two conductors as specified by the design. Confirm the neutral and pole arrangement.
Reference only
3. MCB Three Pole (3P)
Three-pole miniature circuit breaker for three-phase branch or distribution circuits. Match current rating, trip curve, fault level and upstream coordination.
Bule product range
4. MCB Four Pole (4P)
Four-pole miniature circuit breaker for suitable three-phase and neutral arrangements. Confirm whether the neutral pole is switched and whether the design calls for protection on each pole.
Reference only
Residual-Current Protection
5. RCCB Double Pole (2P)
Two-pole residual-current circuit breaker that detects imbalance to support earth-fault protection. It does not itself provide overload or short-circuit protection; specify type and sensitivity.
Bule product range
6. RCCB Four Pole (4P)
Four-pole residual-current circuit breaker for appropriate three-phase installations. Confirm required residual-current type, sensitivity, rated current and upstream overcurrent protection.
Bule product range
7. RCBO Single Pole + Neutral (1P+N)
Combined residual-current and overcurrent protective device for single-phase circuits. Selection depends on RCD type, sensitivity, trip characteristic and breaking capacity.
Reference only
8. RCBO Three Pole + Neutral (3P+N)
Combined residual-current and overcurrent protective device for applicable three-phase circuits. Confirm the neutral connection, fault level and manufacturer operating arrangement.
Reference only
Moulded-Case Circuit Breakers
9. MCCB Three Pole (3P)
Three-pole moulded-case circuit breaker for three-phase feeders and distribution panels. Specify frame size, trip-unit rating, interrupting capacity and coordination requirements.
Bule product range
10. MCCB Four Pole (4P)
Four-pole moulded-case breaker used where the project design calls for switching or protection including neutral arrangements. Check trip-unit options and pole configuration.
Reference only
11. Adjustable Thermal-Magnetic MCCB
MCCB with adjustable thermal and/or magnetic protection settings on supported models. Settings must be established by the electrical protection study, not chosen from appearance alone.
Reference only
12. Electronic Trip MCCB
MCCB using electronic protective trip functions for suitable feeders. Review long-time, short-time and instantaneous settings alongside selectivity requirements.
Reference only
Air Circuit Breakers
13. Fixed Type ACB
Fixed-mounted air circuit breaker used for main low-voltage distribution duties in appropriately designed switchboards. Confirm rated current, breaking capacity, trip unit and installation clearances.
Bule product range
14. Draw-Out Type ACB
Withdrawable air circuit breaker with an associated cradle for isolation and maintenance arrangements. Installation, interlocks and matching switchboard components require engineering review.
Reference only
Isolation and Switching
15. Main Isolator Switch 2P
Two-pole isolator for disconnecting appropriate circuits under the design requirements. Confirm utilization category, current rating and whether load-breaking duty is required.
Bule product range
16. Main Isolator Switch 4P
Four-pole isolator for suitable three-phase distribution arrangements. Confirm the neutral-pole function, utilization category and equipment installation method.
Bule product range
17. Switch Disconnector 3P/4P
Three- or four-pole switch-disconnector for isolation and load switching where supported by its utilization category. Confirm pole count, current rating and handle options.
Bule product range
18. Fuse Switch Disconnector
Device combining a switching mechanism with fuse-based protection in compatible installations. Specify suitable fuse type, current rating, switching duty and enclosure.
Reference only
Surge Protection Devices
19. Type 2 SPD — Single Phase
Type 2 surge protective device used in suitable single-phase low-voltage distribution installations. Select by earthing arrangement, voltage rating, discharge performance and backup protection.
Reference only
20. Type 2 SPD — Three Phase
Type 2 surge protection for appropriate three-phase distribution boards. Verify network configuration, protective modes, installation location and coordination with upstream devices.
Reference only
21. Type 1+2 Combined SPD
Combined surge protective device for installations whose lightning and overvoltage risk assessment calls for Type 1 and Type 2 duties. Coordination and earthing are critical.
Reference only
Fuses and Fuse Holders
22. Cylindrical Fuse Holder
Modular holder for compatible cylindrical fuse links, often on DIN rail. Confirm fuse dimensions, current and voltage ratings and disconnection requirements.
Reference only
23. Cylindrical Fuse Link
Replaceable fuse cartridge for appropriate equipment and feeder protection. Specify cartridge size, utilization class, rated current and voltage.
Reference only
24. NH Fuse Base
Mounting base for compatible NH knife-blade fuse links in distribution applications. Confirm fuse size, insulation rating and handling safety provisions.
Reference only
25. NH Fuse Link
High-breaking-capacity knife-blade fuse link for appropriately designed industrial and distribution applications. Match size, gG or other class, current and voltage rating.
Reference only
Motor and Electrical Protection
26. Motor Protection Circuit Breaker (MPCB)
Motor protective breaker used for appropriate motor feeders. Select adjustable current range against motor nameplate full-load current and required short-circuit coordination.
Bule product range
27. Phase Failure / Phase Sequence Relay
Monitoring relay for phase loss, sequence or other supported three-phase supply faults. Confirm monitored voltage, output contact arrangement and time delay settings.
Bule product range
28. Overvoltage & Undervoltage Protection Relay
Voltage monitoring relay that detects supply voltage outside configured limits. Confirm single-/three-phase compatibility, setting range, relay outputs and reset behavior.
Bule product range
29. Earth Leakage Protection Relay
Monitoring and protection relay used with an appropriate residual-current sensor and tripping arrangement. Specify sensing range, delay, CT compatibility and coordination.
Bule product range
Circuit Breaker Accessories
30. Shunt Trip Release
Remote opening accessory for compatible circuit breaker ranges. Check exact manufacturer series and coil supply voltage before selection.
Reference only
31. Undervoltage Release
Circuit breaker accessory that can trip or prevent closing under inadequate control voltage. Check compatible breaker series and control-circuit design.
Reference only
32. Auxiliary / Alarm Contact
Auxiliary or alarm contact for indication of circuit breaker status or trip condition. Compatibility is model-specific; verify NO/NC arrangement and mounting position.
Bule product range
Solar and DC Protection
33. DC Miniature Circuit Breaker
Direct-current rated miniature circuit breaker used in appropriate DC systems. Verify DC voltage, polarity requirements, breaking capacity and manufacturer connection diagrams.
Reference only
34. DC Surge Protection Device
Surge protective device for suitable DC or photovoltaic installations. Select against the maximum DC system voltage and the specific electrical protection design.
Reference only
35. Solar PV Fuse & Fuse Holder
PV-rated fuse and compatible holder for suitable photovoltaic string protection. Check gPV classification, string fault calculations, voltage and dimensions.
Reference only
36. DC Isolator Switch
DC-rated isolator for photovoltaic or other compatible DC equipment. Confirm rated DC voltage/current, number of poles and manufacturer wiring diagram.
Reference only