neptronic B Series BT100S Line Voltage Actuators Instruction Manual

June 3, 2024

Specification & Installation Instructions


• Mounts easy on round & square shaft (with option –8).
• External clutch for manual adjustments.
• Maintenance free.
• Position indicator.
• Fail safe by Enerdrive System 1 (on model 60S, 65S & 80S).
• Auxiliary switches (on model 20S & 80S).
• Reliable control for air damper applications up to 12.5 ft 2 [1.2 m 2 ] (seal-less  damper blades; air friction-dependent).| BT100S, BT105S
BT120S, BT160S
BT165S, BT180S
BT200S, BT205S
BT220S, BT260S
BT265S, BT280S
Technical Data| BT100S| BT105S| BT120S| BT200S| BT205S| BT220S| BT160S| BT165S| BT180S| BT260S| BT265S| BT280S
Auxiliary switches| No| No| Yes (2)| No| No| Yes (2)| No| No| Yes (2)| No| No| Yes (2)
Feedback| No| Yes| No| No| Yes| No| No| Yes| No| No| Yes| No
Power supply| 110 to 130 VAC 50/60Hz| 220 to 250 VAC 50/60Hz| 110 to 130 VAC 50/60Hz| 220 to 250 VAC 50/60Hz
Fail safe – Enerdrive| No| Yes
Power consumption| 6 VA| 20VA Peak, 6VA
Control signal| 3 wire / 2 position, 4 wire / 3 point floating| 2 wire / 2 position, 4 wire / 3 point floating
Ingress protection| IP22 equivalent to Nema type 2, IP54 equivalent to Nema type 3R if water tight inlet bushings (not supplied NEP617) are installed| IP22 equivalent to Nema type 2
Running time through 90°| 90 – 110 sec, (Fail-safe 20-35 sec)
Torque| 50 [5.6 Nm] at rated voltage
Electrical connection| 18 AWG [0.8 mm2] minimum
Inlet bushing| 2 inlet bushing of 13/16 in [20.6 mm]
Angle of rotation| 0 to 90 degrees, mechanically adjustable (factory set with 90° stroke)
Direction of rotation| Reversible, Clockwise (CW) or Counterclockwise (CCW) (factory set with CW direction)
Ambient temperature| -22°F to 122°F [-30°C to 50°C]
Storage temperature| -22°F to 122°F [-30°C to 50°C]
Relative Humidity| 5 to 95 °A) non condensing.
Weight| 3 lbs. [1.4 kg]
Warning: Do not press the clutch when actuator is powered


Dimension Inches Metric (mm)
A 1.50 38.1
B 3.64 92.5
C 6.60 167.5
D model 00S, 05S & 20S 3.02
model 60S, 65S & 80S 3.81 96.8


We strongly recommend that all Neptronic® products be wired to a separate transformer and that transformer shall service only Neptronic® products. This precaution will prevent interference with, and/or possible damage to incompatible equipment.
When multiple actuators are wired on a single transformer, polarity must be observed. Long wiring runs create voltage drop which may affect the actuator performance.

1 Ener drive System U.S.A. Patent #5,278,454

Specification & Installation Instruction

Mechanical Installation

  1. Manually close the damper blades and positioned the actuator at 0º or 90º.
  2. Slide the actuator onto the shaft.
  3. Tighten the nuts on the “U” bolt to the shaft with a 8mmwrench to a torque of 60 [6,7 Nm].
  4. Slide the mounting bracket under the actuator. Ensure free movement of the slot at the base of the actuator. The bracket pin must be placed in the mid distance of the slot.
  5. Fix the bracket to the ductwork with #8 self-tapping screws.

Wiring Diagrams

Caution: Risk of electric shock. Remove power prior to connect.

Models BT100S, 105S, 120S, 200S, 205S & 220S| Models BT160S, 165S, 180S, 260S, 265S & 280S

PC Board

Dip switch settings

Rotation direction (SW1)

Fail safe direction (SW2)

Stroke Adjustment

To adjust the stroke, move the adjustment screws at the desired position.

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