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Power-off brakes engage when electrical power is removed and release when voltage is applied. This fail-safe behavior is the defining characteristic — if power is cut intentionally or lost unexpectedly, the brake applies automatically. No control signal required to hold the load.
The engagement mechanism is a set of compression springs that clamp a friction disc against the armature when de-energized. Applying DC voltage to the coil generates an electromagnetic field that compresses the springs and creates an air gap between the friction disc and armature, releasing the brake.
Power-off brakes are the correct choice for vertical axes where a dropped load is a safety risk, servo and stepper motor holding applications, emergency stop (E-stop) functions, parking brake duties at zero RPM, and any axis where power loss must result in a held or stopped condition.
Electromate carries power-off spring-applied brakes from Inertia Dynamics and Ogura Clutch. All Inertia Dynamics spring-applied brakes are UL recognized to U.S. and Canadian safety requirements. Available voltages are 6 VDC, 24 VDC, and 90 VDC depending on series and size. Torque range across the full product line runs from under 1 in-lb to over 100 ft-lbs.
Series Comparison Table
Series
Manufacturer
Mounting
Engagement Type
Torque Range
Voltage
Key Feature
FSB
Inertia Dynamics
Flange / C-Face
Spring-applied, power-off
3–15 lb-ft
6, 24, 90 VDC
Single and double C-Face variants; heavy-duty enclosure option
FSBR
Inertia Dynamics
Reverse flange
Spring-applied, power-off
3–15 lb-ft
6, 24, 90 VDC
Short shaft clearance; manual release lever option
A spring-applied power-off brake engages automatically when electrical power is removed. Internal compression springs clamp a friction disc against the armature to stop or hold the load. Applying DC voltage generates an electromagnetic field that compresses the springs and releases the brake. This fail-safe behavior makes spring-applied brakes the standard choice for servo motor holding, vertical axes, and emergency stop applications.
What is the difference between the FSB and FSBR brake series?
Both are flange-mounted spring-applied brakes from Inertia Dynamics, but the FSBR uses a reverse mounting sequence designed for motors with short shaft extensions or where minimum axial space is needed. The hub installs on the shaft first, then the brake mounts over the hub. The FSB mounts in the conventional sequence to a bulkhead or motor face.
What is the SAB brake used for?
The Inertia Dynamics SAB is a spring-applied brake designed for static engagement and disengagement at zero RPM only. It is a parking brake — used to hold a load in position after the axis has stopped moving. It is not suitable for dynamic stopping while the shaft is rotating.
What does the Inertia Dynamics MPC brake do differently from the FSB?
The MPC is a complete C-Face brake module with an integrated output shaft. It mounts directly to a C-Face motor and the output couples directly to a C-Face gear reducer, eliminating the need for separate couplings between motor, brake, and gearhead. It is the preferred solution for compact brake-motor packages on smaller servo and stepper frame motors.
Are spring-applied brakes suitable for servo motors?
Yes. Spring-applied power-off brakes are widely used on servo and stepper motors for holding position when the motor is de-energized. The Inertia Dynamics FSB, FSBR, and SAB series and the Ogura SNB series are all suitable for servo motor brake applications. The SAB is specifically rated for static zero-RPM engagement, which matches the operating sequence of most servo holding brake applications.
What voltages are available for spring-applied brakes?
Spring-applied brakes from Inertia Dynamics are available in 6 VDC, 24 VDC, and 90 VDC. Ogura SNB series brakes are available in 24 VDC and 90 VDC. 24 VDC is the most common selection for servo and automation applications.
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