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: 60 x 60 x 25mm (2.36 x 2.36 x 1")
Mounting Center: 50mm (1.97")
Rating: 24VDC
Current: 0.1 Amps
Power: 2.4 W
Bearing: Sleeve
Speed: 3200 RPM
Noise: 25 dBA
Max Air: 16.7 CFM
Max Pressure: 3.1 mmH2O
Temperature: -10 to +70 C
Hours: 20000-30000
Termination: Wire leads
Weight: 75g
Impeller: Glass fibre reinforced plastic 94V-0 PBT
Frame: Glass fibre reinforced plastic 94V-0 PBT