Capacitor Rebel URZ3128 3.75µF 450V – film capacitor for motor and lighting circuits

Rebel URZ3128 is a 3.75µF, 450V AC film capacitor designed for motor start/run, lighting and general alternating-current circuit applications. The capacitor offers stable capacitance and low dissipation typical of polyester film dielectrics, providing dependable performance under continuous voltage stress. Its compact rectangular body and axial/leaded termination make it suitable for retrofit and new installations in fans, compressors, small motors and professional lighting fixtures.

Advantages

This film capacitor delivers a stable 3.75µF capacitance with low dielectric loss and good temperature stability, which helps maintain motor torque and lighting power factor. The 450V AC rating provides margin for typical household and industrial AC circuits. As a film type, it resists aging better than electrolytic alternatives and withstands repeated charge–discharge cycles with consistent performance. The device’s compact footprint supports space-constrained assemblies and simplifies replacement tasks.

Suitable for

• Motor start/run circuits in small fans, blowers and compressors
• Power factor correction and smoothing in lighting fixtures and stage equipment
• General AC coupling, timing or filtering in household and industrial appliances

Key specifications

• Nominal capacitance: 3.75 µF
• Rated voltage: 450 V AC
• Dielectric type: polyester film (film capacitor)
• Configuration: leaded/axial termination suitable for PCB or point-to-point wiring
• Dielectric loss: low dissipation factor for stable performance under load
• Operating temperature range: suitable for typical ambient conditions in motors and lighting fixtures

How to use

Before installation, ensure power to the circuit is fully disconnected and residual charge is safely discharged from existing capacitors. Verify polarity is not required for this AC film capacitor and install it according to the circuit schematic, observing correct lead orientation and secure mechanical support. Mount the capacitor using appropriate fasteners or solder connections, taking care to avoid excessive heat on the terminals during soldering. After installation, inspect connections and perform a functional test under normal operating conditions to confirm correct operation.

Usage recommendations

Use the Rebel URZ3128 in applications where a stable, low-loss AC capacitance is needed. Avoid exposure to temperatures beyond the recommended operating range and protect the component from mechanical stress and excessive vibration. For long-term reliability in motor start circuits, ensure the capacitor’s voltage and current ratings match or exceed the application requirements. Replace capacitors showing signs of swelling, leakage, burning or large shifts in capacitance.