European standard EN 3 specifies requirements for portable fire extinguishers.^[1] Compliance with the standard is legally required for the construction of all fire extinguishers in the European Union.

The standard has been published in 10 parts:

• EN 3-1: Portable fire extinguishers. Description, duration of operation, class A and B fire test.
• EN 3-2: Portable fire extinguishers. Tightness, dielectric test, tamping test, special provisions.
• EN 3-3: Portable fire extinguishers. Construction, resistance to pressure, mechanical tests.
• EN 3-4: Portable fire extinguishers. Charges, minimum required fire.
• EN 3-5: Portable fire extinguishers. Specification and supplementary tests.
• EN 3-6: Portable fire extinguishers. Provisions for the attestation of conformity of portable fire extinguishers in accordance with EN 3-1 to 3-5. Amendment 1
• EN 3-7: Portable fire extinguishers. Characteristics, performance requirements and test methods.
• EN 3-8: Portable fire extinguishers. Additional requirements to EN 3-7 for the construction, resistance to pressure and mechanical tests for extinguishers with a maximum allowable pressure equal to or lower than 30 bar.
• EN 3-9: Portable fire extinguishers. Additional requirements to EN 3-7 for pressure resistance of CO₂ extinguishers.
• EN 3-10: Portable fire extinguishers. Provisions for evaluating the conformity of a portable fire extinguisher to EN 3-7.

EN 3-1, EN 3-2, EN 3-4 and EN 3-5 have been withdrawn and were replaced by EN 3-7, EN 3-8 and EN 3-9.^{[2][3][4][5][6]}

EN 3-6 has been withdrawn and was replaced by EN 3-10.^[7]