Details

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🔌 MC18B Contactor

• Magnetic contactor used to switch power to an electric motor

• The “18” in MC18B typically means it’s rated for about 1.8–2.2 kW / ~2.5–3 HP (depending on voltage & duty)

• Works with thermal overload relays like your MT-32 series

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💡 MC18B vs MC32A

Feature	MC18B	MC32A
Motor size	Up to ~2.0 HP	Up to ~3–5 HP
Use	Smaller motors	Larger motors
Pairing	Works with MT-32 relays	Works with MT-32 relays

For a 2.0 HP motor, MC18B is a very good match — often better sized than MC32A, which is sometimes oversized for this power.

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✅MC18B Work With MT-32 Overload

Yes — MC18B can be paired with the MT-32 thermal overload relay (like your MT323H), just like MC32A.

You set the overload relay based on the motor’s Full Load Amp (FLA):

1. Contactor (MC18B): switches motor ON/OFF

2. Overload (MT323H): protects against overcurrent

Together they form your D.O.L Starter

📊 1. Motor Full Load Amps

Check the motor nameplate. Example typical FLA:

Motor	Voltage	FLA (approx)
2.0 HP	240 V (1φ)	~10–12 A
2.0 HP	415 V (3φ)	~3.0–4.0 A

🔧 3. Set Overload Relay

Turn the MT-323H dial to match the motor’s FLA exactly.

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🛠 Recommended Starter Setup for 2.0 HP

Component	Recommended
Contactor	MC18B
Overload relay	MT323H (set to motor FLA)
Starter type	D.O.L Starter
Coil voltage	Match your control supply (240 V / 110 V etc.)