• 175 lb-in. (20 Nm) minimum driving torque at 350F (176C).
• Integral stainless steel spring return ensures level of return torque.
• Reversible mounting allows actuator to be used for either clockwise (cw) or counterclockwise (ccw) spring rotation.
• Fifteen-second spring return timing.
• No special cycling required during long-term holding.
• No audible noise during holding.
• Patented design eliminates need for limit switches and reduces power consumption.
• Models available with integral high temperature (350 F) SPST position-indicating switches (<7 degrees, >85 degrees).
• High temperature Teflon® lead wires.
• Ninety-five degree angle of rotation for tight damper closure.
• Actuator holds rated torque at reduced power level.
• Die-cast aluminum housing. Housing design allows flush mounting to damper.
• High-temperature indicator included.
• Self-centering shaft adapter (SCSA), patented.FAST-ACTING, TWO-POSITION ACTU 0| Minimum Driving Torque at 350 F (lb-in.) | 175 lb-in. |
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| Overview | The MS4620 is a 175 lb-in (20Nm), spring return direct-coupled, 230 Vac actuator that accepts two position (SPST) control with an integral junction box. The actuator accepts an on/off signal from a single-pole, single-throw (SPST) controller. They are des |
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| Application Type | Fire and Smoke |
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| Torque/Force (lb-in., lbf) | 175 lb-in. |
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| Torque/Force (Nm, N) | 20 Nm |
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| Minimum Driving Torque at 175 C (Nm) | 20 Nm |
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| Electrical Connection Length (in.) | 40 in. |
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| Minimum Driving Torque at 350 F (Nm) | 20 Nm |
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| Electrical Connection Length (m) | 1 m |
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| Supply Voltage | 230 Vac ±10% |
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| Fail Safe Mode | Spring Return |
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| Number of Internal Auxiliary Switch | 2 |
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| Switch Ratings | 250 Vac, 5 A res |
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| Ingress Protection Rating | IP54 |
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| Shaft Adapter Type | Self-centering clamping |
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| Manual operation | Manual crank |
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| Spring Return Torque/Force (lb-in., lbf) | 175 lb-in. |
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| Spring Return Torque/Force (Nm, N) | 20 Nm |
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| Maximum Stall Torque/Force (lb-in., lbf) | 425 lb-in. |
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| Maximum Stall Torque/Force (Nm, N) | 48 Nm |
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| Rotational Stroke | 95 ±3 degrees |
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| Spring Return Direction | By orientation |
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| Timing, Maximum Spring Return (sec) | 15 sec |
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| Timing, Nominal Driving @ 60 Hz (sec) | 15 sec |
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| Compatible Damper Shafts (in.) | 3/8 to 1.06 in. round or 3/8 to 11/16 in. square |
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| Compatible Damper Shafts (mm) | 10 to 27 mm round or 10 to 18 mm square |
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| Materials | Aluminum housing |
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| External Auxiliary Switches Available | No |
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| Power Consumption (Driving) | 0.20A, 35W |
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| Power Consumption (Holding) | 0.14A, 10W |
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| Dimensions (in.) | 10.67 in high x 3.94 in wide x 2.95 in deep |
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| Electrical Connections | Teflon-jacketed cable |
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| Temperature Range, Ambient (F) | -40 F to +130 F |
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| Dimensions (mm) | 271 mm high x 100 mm wide x 75 mm deep |
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| Temperature Range, Ambient (C) | -40 C to +55 C |
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| Temperature Range, Storage (F) | -40 F to +140 F |
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| Temperature Range, Storage (C) | -40 C to +60 C |
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| Maximum Noise Rating, Driving (dB(A) @ 1m) | 70 |
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| Maximum Noise Rating, Holding (dB(A) @ 1m) | 20 (no audible noise) |
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| Environmental Rating | NEMA2 |
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| Approvals, Canadian Underwriters Laboratories | cUL C22.2 No. 24-93 |
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| Approvals, CE | 89/336/ECC, 73/23/EEC |
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| Operating Humidity Range (% RH) | 5 to 95% RH, non-condensing |
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| Approvals, Underwriters Laboratories Inc | UL873, Plenum Rated |
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| Includes | Self-centering shaft adapter, 3mm crank |
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| Comments | Two integral 3/8 in. flexible conduit connections |
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