Locked Rotor Alarm Signal Output (yellow wire lead): Under normal conditions a locked rotor alarm signal outputs a constant signal frequency... if the fan stops spinning or "locks", it then outputs a "LOW" condition signal. If the fan starts spinning again, the "LOW" condition signal will go away.
 
Features:
 
Dimensions: 92 x 92 x 25mm (3.62 x 3.62 x 1")
Mounting Center: 82mm (3.25")
Rating: 24VDC
Current: 0.14 Amps
Power: 3.36 W
Bearing: Sleeve
Speed: 2500 RPM
Noise: 34 dBA
Max Air: 50.5 CFM
Max Pressure: 3.5 mmH2O
Temperature: -10 to +70 C
Hours: 20000-30000
Termination: Wire leads
Weight: 120g
Impeller: Glass fibre reinforced plastic 94V-0 PBT
Frame: Glass fibre reinforced plastic 94V-0 PBT