The JOB Extinguishing Bulb (E-Bulb) is an innovative development derived from the sprinkler glassbulbs.

The Challenge

At home, as well as in the industry, there are countless technical devices and appliances to support our modern daily life. Most of this equipment are electronic products of some sort. It can be computers, dishwashers or dryers, entertainment and lighting equipment, switchboards or smart home devices. In the industry, computer hardware, electronic equipment, electric cabinets and PCB boards can be found pretty much everywhere.

While having all these products makes life more comfortable, they also pose an increased danger of electrical faults, or even fires. Globally, more than 30% of all fires are caused by electric or electronic equipment or installations. With the inherent risk of fire from electric devices, danger for life and loss of property or equipment values increases with the number of such devices around us.

Following the vision “A world where everyone is protected against the dangers of fi re, everywhere and anytime”, JOB has developed solutions to detect and extinguish electric fires when they are still small and in an early stage. With the internationally protected E-Bulb, JOB has designed a reliable system that detects heat inside an electric device (e.g. from fire), extinguishes the fire and – most importantly – prevents a fire from re-igniting by interrupting the electric power supply.

The Solution

For protection of life and property, thermally activated glass bulbs are billion-fold successfully used in the global sprinkler industry. The glass bulb breaks at a defined temperature; the sprinkler opens and releases water onto the fire to effectively extinguish. The JOB E-Bulb is the next evolutionary product development step, building upon the proven technology of JOB’s outstanding quality sprinkler bulbs.


JOB’s E-Bulb is filled with 3M™ Novec™ Engineered Fluid. This non-toxic, non-conductive extinguishing liquid is released into the device when the defined temperature is reached and the Thermo-Bulb bursts. After being initiated, the E-Bulb extinguishes the fire, and interrupts the electric current. Transition-free, the liquid immediately converts into gas. As a result of cooling and (partly) by oxygen reduction, a fire on a PCB will be extinguished within seconds. And, because the current flow over the E-Bulb is interrupted, the electric fire cannot re-ignite!


For more information, please contact Markus Fiebig

Fire starts due to electronic failure 

The E-Bulb automatically detects and extinguishes the fire

The advantages at a glance

  • JOB Thermo Bulbs are billion-fold provedsafety products
  • Easy to install
  • Operating temperatures (ambient, triggering) can be customized
  • Maintenance free
  • Novec™ 3M™ poses no health hazard
  • Retrofittable into existing designs
  • Non-corrosive extinguishing agent
  • Zero ODP / non-ozone hazard
  • Non-reactive with other materials
  • Can be used as a passive fire detection and extinguishing device (no power interruption)
  • Non-conductive extinguishing agent
  • Reduces alternative fault-protection needs on PCBs


  Dimensions (standard)*
  Ø 5 x 20 mm Ø 5 x 40 mm Ø 7 x 40 mm
Protected Volume V4% [ml]1 416 1,049 2,212
Protected Volume V4% [fl oz]1 14

35 1⁄2



E-Bulb is available in a variety of electrical specifications*
Currents: <1A <5A <10A <16A
Voltages: 0..250V AC/DC 0..250V AC/DC 0..250V AC/DC 0..250V AC


In accordance with NFPA 2001 “Clean Agent Extinguishing Systems”
* other sizes and volumens are available upon request


Approvals and references

  • Effectiveness verification by MPA Institute Dresden
  • VDE information testing successfully accomplished
  • VDS certified *NEW*
  • The E-Bulb is a CIFEA (UL 60692) and a UL Recognized Component

Electrical ysmbol of the E-Bulb

Other products by JOB

Due to the high product quality and reliability, the Thermo Bulbs have become the standard in the sprinkler industry

Thermo Bulb Links can be used in virtually any area where a positive thermally actuated self-releasing mechanism is required to operate in the event of fire.

The AMFE detects and extinguishes fires in cabinets such as electrical equipments and thus prevents the spread of fire.