• Brushless DC submotor with electronic stall protection for floating/modulating models. • Brush DC submotor with electronic stall protection for 2-position models. • Self-centering shaft adapter (shaft coupling) for wide range of shaft sizes. • Models available for use with two-position, single pole single throw (spst), line- (Series 40) or low- (Series 80) voltage controls. • Models available for use with floating or switched single-pole, double-throw (spdt) (Series 60) controls. • Models available for use with proportional current or voltage (Series 70) controls. • Models available with combined floating/modulating control in a single device. • Models available with adjustable zero and span. • Models available with line-voltage internal end switches. • Models available with three-foot, 18 AWG color-coded cable. • Access cover to facilitate connectivity. • Metal housing with built-in mechanical end limits. • Spring return direction field-selectable. • Shaft position indicator and scale. • Manual winding capability with locking function. • UL (cUL) listed and CE compliant. • All models are plenum-rated per UL873.DAMPER ACTUATOR, SPRING RETURN, 175 LB-IN (20 NM), (0)2-10VDC & FLOATING CONTROL, ADJ. START & SPAN, 2 INTERNAL SWITCHES, 24 VAC +/-20%, 50/60 HZ, 24 VDC (S20010-SER-SW2)| Input Impedance | Min. 95 kOhm |
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| Rotation to Open | By switch |
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| Overview | The MS7520 is a 175 lb-in (20Nm), spring return direct-coupled, line voltage actuator that accepts on/off (SPDT) or modulating (0/2-10 Vdc) control for: air dampers, air handlers, ventilation flaps, louvers, and ball valves. |
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| Torque/Force (lb-in., lbf) | 175 lb-in. |
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| Feedback | 2-10 Vdc (max. output: ±1.0 mA) |
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| Torque/Force (Nm, N) | 20 Nm |
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| Supply Voltage | 24 Vac ±20% |
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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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| 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) | 350 lb-in. |
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| Maximum Stall Torque/Force (Nm, N) | 39.6 Nm |
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| Rotational Stroke | 95 ±3 degrees |
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| Rotational Stroke Adjustment | Mechanically limited 5 degree increments |
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| Spring Return Direction | By orientation |
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| Timing, Maximum Spring Return (sec) | 20 sec |
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| Timing, Nominal Driving @ 60 Hz (sec) | 90 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, Plenum rated plastic access cover |
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| External Auxiliary Switches Available | Yes, SW2-US |
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| Power Consumption (Driving) | 16 VA |
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| Power Consumption (Holding) | 5 VA |
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| Dimensions (in.) | 9.72 in high x 3.94 in wide x 2.95 in deep |
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| Electrical Connections | Enclosed screw terminal strip (22 to 14 AWG) |
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| Temperature Range, Ambient (F) | -40 F to +140 F |
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| Dimensions (mm) | 247 mm high x 100 mm wide x 75 mm deep |
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| Temperature Range, Ambient (C) | -40 C to +60 C |
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| Temperature Range, Storage (F) | -40 F to +158 F |
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| Temperature Range, Storage (C) | -40 C to +70 C |
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| Maximum Noise Rating, Driving (dB(A) @ 1m) | 40 |
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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 | Mounting bracket, self-centering shaft adapter, 3mm crank |
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| Comments | Integral 1/2 in. NPSM conduit connection. |
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