⚙️ Barber-Colman MA-418 2-Position 120V Rotary Actuator – Spring Return
🧭 Product Overview
The Barber-Colman MA-418 is a robust 2-position rotary actuator designed for dampers, valves, and other control equipment requiring a reliable spring return to normal position upon power loss. With a 120V, 60 Hz operation, this actuator delivers precise torque and timing for industrial, HVAC, and process control applications.
Its oil-immersed motor and gear train ensure smooth, durable operation, while the die-cast aluminum housing protects internal components under demanding conditions. Ideal for two-position damper or valve control, the MA-418 provides consistent performance and long service life.
✅ Key Features
✔️ Voltage & Frequency: 120V, 60 Hz operation
✔️ Power Consumption: 70W running, 25W holding
✔️ Torque: 60 lb-in (6.8 N-m) rated torque
✔️ Timing: 20 seconds no-load operation at 75°F
✔️ Shaft Rotation: CW 170° when energized
✔️ Mounting: Horizontal output shaft required
✔️ Operating Temperature: -40°F to 136°F (-40°C to 58°C)
✔️ Construction: Rugged die-cast aluminum with two 1/2” conduit openings
✔️ Motor/Gear: Oil-immersed for durability and smooth operation
✔️ Spring Return: Returns equipment to normal position upon power interruption
⚙️ Specifications
| Specification | Details |
|---|
| Brand |
Barber-Colman |
| Model |
MA-418-0-0-4 |
| Type |
2-Position Rotary Actuator |
| Voltage |
120V |
| Frequency |
60 Hz |
| Current |
0.9 Amps |
| Power Running |
70 W |
| Power Holding |
25 W |
| VA Running |
108 VA |
| VA Holding |
42 VA |
| Rated Torque |
60 lb-in (6.8 N-m) |
| No Load Timing |
20 seconds at 75°F |
| Shaft Rotation |
CW 170° when energized |
| Mounting |
Output shaft horizontal |
| Operating Temperature |
-40°F to 136°F (-40°C to 58°C) |
| Construction |
Die-cast aluminum, oil-immersed motor and gear train |
| Control Type |
Spring return for two-position operation |
⚠️ Common Symptoms / When to Replace
-
Actuator fails to reach full 170° rotation
-
Equipment does not return to normal position on power loss
-
Unusual noise from gear or motor
-
Inconsistent torque or timing
-
Electrical faults (overheating or tripping breaker)
💬 Frequently Asked Questions (FAQ)
Q: What applications is the MA-418 suitable for?
A: Designed for dampers, valves, and other two-position control equipment requiring spring return.
Q: Can it be mounted vertically?
A: No — the output shaft must be horizontal for proper operation.
Q: What is the torque rating?
A: Rated torque is 60 lb-in (6.8 N-m).
Q: How fast does it operate?
A: No-load timing is approximately 20 seconds at 75°F.
Q: Does it provide power loss protection?
A: Yes — spring return returns the controlled device to its normal position if power is interrupted.
🛒 Shopping Tips
-
Confirm your application requires 2-position spring return operation.
-
Ensure mounting allows horizontal output shaft orientation.
-
Check torque requirements to match controlled equipment.
-
Verify voltage and frequency compatibility (120V, 60 Hz).
-
Annual inspection recommended for long-term reliability.
