A detailed technical and buyer-friendly guide explaining how hot aerosol fire suppression works inside electrical panels, DB boxes, solar cabinets, EV chargers and small enclosed spaces.
Aerosol fire suppression is a compact automatic fire protection technology used inside relatively enclosed spaces such as electrical panels, distribution boards, control cabinets, solar inverter panels, EV charger enclosures, UPS cabinets and battery cabinets.
Unlike a hand-held extinguisher, it is not dependent on a person reaching the fire. Unlike sprinkler systems, it does not use water. Unlike cylinder-based clean agent systems, it does not require a pressurised cylinder or pipe network for small panel-level applications.
A hot aerosol device contains a solid aerosol-forming charge. When activated by a flame source, high temperature or electrical signal depending on model, the charge undergoes a controlled internal reaction. This produces a fire-suppressing aerosol cloud made of gases and extremely fine solid particles suspended in those gases.
The aerosol does not come out and then explode on contact with fire. The reaction happens inside the generator. The released cloud fills the protected enclosure and suppresses the flame mainly by interrupting the chemical chain reaction of combustion.
The flame and hot fault area supply energy to continue burning.
Insulation, dust, plastic components, oil vapour or other combustible material reacts with oxygen.
Free radicals such as H, O and OH keep the flame chemistry alive.
Hot aerosol agents are generally solid formulations containing oxidisers, reducing agents, binders and burn-rate control additives. Many industry formulations use potassium nitrate or strontium nitrate. The MSDS available for the referenced hot aerosol device lists ammonium nitrate, starch, epoxy resin adhesive and a moisture-proof additive. This indicates a solid oxidiser-fuel formulation designed to generate gas and aerosol products after activation.
| Component type | Purpose | Examples |
|---|---|---|
| Oxidiser | Supports controlled internal reaction without needing outside oxygen. | Metal nitrates or ammonium nitrate depending on formulation. |
| Fuel / reducer | Provides energy and drives aerosol generation. | Organic compounds, starch, carbon-based materials. |
| Binder / additive | Maintains shape, moisture resistance, stability and controlled burn rate. | Resins, additives, regulators. |
The discharge is not a pure gas. It is better understood as a cloud. The gas phase may include nitrogen, carbon dioxide and water vapour. The solid phase contains ultra-fine particles such as salts, oxides or carbonates depending on formulation. These particles are very small, remain suspended for a short period and interact with the flame zone.
| System | Strength | Limitation | Best use |
|---|---|---|---|
| MCB / MCCB | Trips during overcurrent or short circuit. | It does not extinguish fire already started inside a panel. | Electrical protection. |
| RCCB / ELCB | Detects leakage current. | Does not suppress flame. | Shock and leakage protection. |
| ABC powder extinguisher | Effective manual firefighting tool. | Needs a person present and leaves heavy residue. | General manual firefighting. |
| COâ‚‚ extinguisher | Clean manual extinguishing for electrical fires. | Needs a person present; concentration is difficult in open spaces. | Manual electrical fire response. |
| FireKavach aerosol device | Automatic, compact, pressure-free and panel-level suppression. | Designed for relatively enclosed spaces; single-use after activation. | DB boxes, panels, cabinets and enclosures. |
DB boxes, MCB boards, MCC panels, control panels and switchgear where fire can start due to arcing, loose joints or overheating.
ACDB, DCDB, inverter panels, EV charger cabinets, battery boxes and other compact electrical enclosures.
Small DBs and commercial panels where fire may start when no one is nearby to use a manual extinguisher.
No. Aerosol is a mixture of gases and extremely fine solid particles suspended in the gas stream. Gas systems such as COâ‚‚ or clean agents are mainly gaseous discharge systems.
Only partly. The main action is chemical inhibition of the flame chain reaction, supported by heat absorption and limited dilution.
FireKavach is best suited for relatively enclosed panels or cabinets where aerosol concentration can build up. It is not intended as a replacement for room-level statutory fire systems.