Molex's Brad® Mini-Change® connectors are divided into A-size, B-size, and C-size. These three "sizes" are not a simple classification of the number of pins, but a classification standard for the connector shell size, which mainly involves differences in the connector's external dimensions, supported current and voltage levels, and typical uses.
The following is a detailed comparison between them:
A-size (standard size)
- Thread interface size: 7/8"-16UN
- Common number of pins: 2, 3, 4, 5, 6 pins
- Current level: 13A max
Typical applications:
- Power connection
- Basic sensor/actuator signal
- DeviceNet, NMEA 2000 bus
- Widely used, the most common Mini-Change size
- Protection level: IP67
B-size (Mid-size)
- Threaded interface size: 1"-16UN
- Common pin count: 6, 7, 8 pins
- Current rating: 4–10A (depending on the number of pins)
Typical applications:
- Multi-channel signal connection
- Control signal + power mix
- Medium-complexity equipment wiring
Features:
- Slightly larger than A-size, supports more pins
- Commonly used in situations where additional control lines are required
- More suitable for modular equipment requiring higher electrical complexity
- Threaded interface size is larger than A-size
C-size (Large Size)
- Threaded interface size: 1-3/8"-18UN
- Common pin counts: 9, 10, 12, 19 pins
- Current level: Small (2–5A), more inclined to signal transmission
Typical applications:
- High-density signal interface (such as industrial robots, automation control)
- Control cabinet connector or I/O interface board
- Largest shell, suitable for high pin density requirements
Features:
- Maximum shell size
- Supports the largest number of pins (up to 19 pins)
- Mostly used in complex systems or scenarios with multiple uses of one line
- Larger threaded interface, stronger load-bearing capacity
| Size | PIN number | Application complexity | Shell size | Typical Uses |
| A-Size | 2, 3, 4, 5, 6 | Low-Medium | Small | Power supply, sensor, DeviceNet, NMEA2000, PROFIBUS |
| B-Size | 6, 7, 8 | Medium | Medium | Control signal mixing, device I/O |
| C-Size | 9, 10, 12, 19 | High | Large | High-density signals, complex automation equipment |
Premier Cable is a professional connector and cable manufacturer with more than 20 years of experience, supporting OEM/ODM customization. We can produce connectors and cable assemblies compatible with Molex Brad® Mini-Change connectors, providing multiple configurations from 2 to 19 pins, supporting T-type, Y-type, H-type splitters and versions with termination resistors, which are widely used in DeviceNet, NMEA 2000, PROFIBUS, industrial automation, and other fields. Welcome to send pictures and samples for inquiry!
