An RC snubber module is a special type of protection circuit board used in electronics to reduce or eliminate unwanted voltage spikes, prevent arcing, and suppress electrical noise. It is called 'RC' because it primarily uses an resistor (R) and a capacitor (C) in series. This circuit is commonly connected in parallel with switches such as transistors, relays, or thyristors that operate with rapid switching.
Specification of RC Snubber Module
The quick technical specification of the circuit board is given below.
| Module Type | Load Protection |
| Load Type | DC or AC |
| Load Voltage Range | 5V to 400V |
| Connection | Parallel with load |
| Load Power Rating | 1000-Watt Max. |
| PCB Colour | Blue |
RC Snubber Module Circuit Diagram
Schematic of rc snubber module circuit is shown below.
Working Principle of RC Snubber Module Circuit
When a semiconductor switching device (e.g., transistors, MOSFETs, IGBTs) turns off especially in inductive circuits, the collapsing magnetic field can generate a high-voltage spike. This spike can exceed their voltage ratings and cause permanent breakdown. Similarly, in relay switch circuit with inductive load, arcing (spark) can occur at the relay contacts (NO, COM, NC) which potentially leading to burnout.
The working principle of the RC snubber circuit is simple. The capacitor (C1) absorbs the voltage spike or arc to prevent it from reaching the switch, while the series resistor (R2) dissipates the energy stored in the capacitor to prevent oscillations. Additionally, a parallel varistor (R1) provides backup protection by clamping any spike that exceeds 470V.
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