MR30 connectors
MR30 Connector kit includes 4 male and 4 female plugs. Gold-plated for low resistance and a secure fit, they’re perfect for combat robots, RC, and drones. Used on our Saifu kit to connect the hubmotor. Makes 3 wire brushless motor connections easy! Polarity makes it impossible to plug in your bit incorrectly!
$6.75
Overview
Amass MR30 Connectors give you a clean, keyed way to connect three-wire brushless motors to ESCs. The rigid housing is non-reversible (keyed), so it only mates one way—no more crossed phases or reversed polarity during fast pit swaps. Get your polarity right the first time, and it will be right forever. Gold-plated contacts keep resistance low and signal/power delivery consistent under load. Kit includes 4 male + 4 female connectors (4 pairs).
Why MR30 for combat robots?
- Keyed, non-reversible housing: prevents incorrect mating—unlike three loose bullets that can be swapped by mistake.
- Built for 3-phase brushless: one plug handles all three motor leads for tidy, modular wiring.
- Low resistance, gold-plated pins: solid current flow and corrosion resistance.
- Field-serviceable: quick motor/ESC swaps between matches without chasing three separate connectors.
- Compact & light: great for Ant/Beetle builds where every gram and mm counts.
Typical applications
- Brushless drive motors → ESC (3-wire)
- Weapon motor modules → controller harnesses
- Bench test harnesses and quick-swap service leads
Installation tips
- Map your phases first: label A-B-C on motor and ESC before soldering; if rotation is wrong, swap any two motor leads on one side, then lock that map in your harness.
- Wire gauge: 18–16AWG is typical for MR30 class; choose based on current and run time.
- Soldering: tin wire and cup, join quickly to avoid softening the plastic; support the wire (strain relief) so impacts don’t lever the joint.
- Heat-shrink placement: cover each joint and extend the tubing to the edge of the mating surface—not past it—so the halves seat fully.
- Final check: tug-test each lead, then verify spin direction before your first match.
Amass MR30 connectors are purpose-built for 3-wire brushless connections with a non-reversible, keyed shell. When the housings are aligned, the plug can only mate in the correct orientation—reducing wiring errors versus three loose bullets.
Notes & compatibility
- Rating: commonly used around 15A continuous with headroom; up to ~30A in short peaks depending on build and cooling—always derate for combat duty.
- Materials: gold-plated brass/copper pins; high-temp PA (UL94-V0) housing.
- Ecosystem fit: widely used in RC/FPV and robotics; easy to source spares and pigtails.
Features
- Keyed housing: one-way fit prevents incorrect polarity or phase order.
- Clean wiring: simplify complex robot wiring for fit and repair.
- 3-wire brushless ready: one plug handles all three motor leads for clean installs.
- Gold-plated contacts: low resistance, high conductivity, corrosion resistant.
- Compact & lightweight: ideal for Antweight and Beetleweight combat robots.
- Secure snap-fit: firm connection that won’t shake loose under vibration or impacts.
- Service-friendly: enables fast pit swaps—replace a motor or ESC in seconds.
- Complete kit: includes 4 male + 4 female connectors (4 pairs total).
Installation Tips
- Plan wiring first: mark motor phases (A–B–C) and ESC leads before soldering. MR30’s keyed housing prevents reversed polarity once installed.
- Wire gauge: 18–16AWG is recommended for most Ant/Beetle combat robots.
- Solder quickly: tin both the wire and the connector cup; insert while molten. Avoid prolonged heat to protect the housing.
- Test motor direction: after soldering the leads but before adding heat-shrink, power up the motor and check spin direction. If it runs backward, swap any two wires and re-solder.
- Heat-shrink placement: once spin direction is correct, cover each solder joint with tubing that extends to the connector edge but not past it—ensuring the plug seats fully.
- Strain relief: secure wires so impacts and vibration don’t stress the solder joint.
Specifications
| Category | Specification |
|---|---|
| Connector Type | MR30, 3-pin, keyed housing |
| Material | Gold-plated brass/copper pins, high-temp PA (UL94-V0) housing |
| Current Rating | 15A continuous, up to ~30A short peak (per pin) |
| Voltage Rating | 500V DC max |
| Operating Temperature | -20°C to +120°C |
| Wire Gauge | 18–16AWG recommended |
| Quantity | 4 male + 4 female (4 pairs) |
| Applications | 3-phase brushless motors, ESCs, modular harnesses, RC/robotics |
Frequently Asked Questions
How do I know which wire goes where?
Brushless motors have three phase wires. There’s no fixed “correct” order—just keep the same order on motor and ESC. If the motor spins backwards during testing, swap any two wires to reverse direction.
What’s the best way to set motor direction?
Here’s a reliable method:
- Solder the motor leads into the MR30 temporarily (no heat-shrink yet).
- Power up the system and check spin direction.
- If it runs backwards, swap any two wires and re-solder.
- Once correct, slide heat-shrink over each joint and shrink it down to lock the wiring in place.
How much current can MR30 connectors handle?
They’re typically rated for about 15A continuous and up to ~30A peak in short bursts. For combat robotics, leave safety margin to account for shock loads and spikes.
What wire gauge should I use?
18–16AWG works best for Antweight and Beetleweight robots. Make sure the insulation fits cleanly into the housing so the connector seats fully.
Can MR30 be reused?
Yes, the housings and pins can be de-soldered and reused if you’re careful, but performance is best with fresh solder joints.
