Self-contained breathing apparatus (SCBA) gives the wearer breathing air from a cylinder they carry, instead of filtering the air around them. That makes it the right choice where filters cannot help: air that is short of oxygen, or contaminated enough to be immediately dangerous to life or health. This guide uses Safe Work Australia's confined spaces code, the European SCBA standard EN 137 and the makers' information on the sets we supply. It is general information and does not replace your site's risk assessment, your respiratory protection program or proper training.
What is SCBA?
An SCBA is a breathing set with its own air supply. The 3M Scott ProPak listings describe the usual layout: a compressed-air cylinder on a rigid backplate and harness, plus a pneumatic system with a cylinder connector, pressure reducer, pressure gauge, warning whistle and demand valve feeding a full face mask. The 3M Scott sets we supply are listed as open-circuit: each breath out goes to the open air rather than back into the set.
The European standard EN 137 covers self-contained open-circuit compressed-air breathing apparatus with a full face mask. It recognises two types, Type 1 for industrial use and Type 2 for firefighting, and leaves escape sets and diving apparatus out.
When do you need SCBA instead of a P2 or P3 respirator?
A P2 or P3 respirator filters particles out of the air you breathe. It adds no oxygen. Safe Work Australia's Model Code of Practice for confined spaces defines a safe oxygen level as 19.5% to 23.5% by volume. Where a safe oxygen level, or safe levels of airborne contaminants, cannot reasonably be achieved, the code says appropriate air-supplied respiratory equipment must be provided, and any worker in a space with less than 19.5% oxygen must be given it. For choosing, using and maintaining respiratory equipment, the code points to AS/NZS 1715:2009.
Air-supplied equipment comes in two main forms: an SCBA, where the air travels with the wearer, and an airline (supplied-air) respirator, fed through a hose from a compressed-air supply. A third option, the escape set, is for getting out, not for working.
SCBA, airline respirator or escape set: what is the difference?
| Type | Air source | How long it lasts | Used for | What we supply |
|---|---|---|---|---|
| SCBA (open-circuit) | Cylinder carried on the back, at up to 300 bar | Set by cylinder size and breathing rate: 61 minutes nominal for a 9 L cylinder at 40 L/min | Firefighting, rescue and entry where the air cannot be made safe | MSA M1; ProPak Sigma, ProPak-i, ProPak-f and ProPak-fx |
| Airline (supplied-air) respirator | Hose from a compressed-air supply, cleaned to breathing quality | As long as the air supply runs | Longer jobs within reach of an air supply | Sundström SR 99-1 airline filter; 3M airline breathing hoses |
| Escape set | Small cylinder: 3 L at 200 bar on the Lifegard III | 15 minutes (Lifegard III) | Getting out of a toxic or oxygen-deficient atmosphere | MSA Lifegard III escape set 764975 |
How long does an SCBA cylinder last?
Duration depends on how much air the cylinder holds and how fast you breathe. The 3M Scott 2460 cylinder holds 9 L at 300 bar, about 2,460 L of air, which the maker rates at a nominal 61 minutes at an air consumption of 40 L per minute. The 6.8 L 3M Scott 1860 holds 1,860 L of air, and its listing gives 46 minutes at constant flow. MSA's carbon fibre cylinders come in 4.3 L, 6.8 L and 9.0 L, all rated to 300 bar (MSA carbon fibre cylinder and valve).
Hard work raises your breathing rate and shortens these times, so treat them as a guide, not a promise. The 3M Scott sets we list include a warning whistle that sounds while air is still left in the cylinder; on the marine compliance set it operates at 55 bar.
How do the SCBA sets we supply compare?
| Set | What the listing says | Suits |
|---|---|---|
| MSA M1 SCBA, Classic Pneumatic | Modular: configure it for the fire service, utilities or general industry and upgrade it in the field. Machine washable without being taken apart. MSA quotes under 4 kg for the height-adjustable SCBA. | A single platform across fire, utility and industrial teams |
| MSA M1 SCBA Compliance Kit | The M1 as a kit. Listed approvals include Australia (BSI), EU (PPE) and EU (MED). Listed applications: fire service and confined space. | Confined space and fire teams buying a complete kit |
| 3M Scott ProPak Sigma 2027150 | Type 2 open-circuit with an unpadded harness, described as a cost-effective compliance set for marine and industrial firefighting. | Compliance sets on vessels and sites |
| 3M Scott ProPak-i 2027166 | Type 2, listed as suitable for any IDLH environment, including industrial, marine and oil and gas firefighting. Padded lower harness; Vision 3 or Promask PP mask. | Industrial, marine and oil and gas teams |
| 3M Scott ProPak-f 2027182 | Type 2 with padded upper and lower harness, for professional SCBA users in fire services and industrial fire teams. | Fire services and industrial fire teams |
| 3M Scott ProPak-fx 2027195 | Type 2 with a height-adjustable backplate and padded harness, for comfort through long deployments. | Long deployments and wearers of different heights |
| 3M Scott SCBA Marine Compliance Set SCBACOMP6T2 | Sigma 2 Type 2 positive-pressure set with a Promask PP mask. Approvals listed: EN 137:2006 Type 2 and MED. Takes 200 and 300 bar cylinders. | Marine firefighting and ship compliance |
Figures and approvals are from the manufacturer information on each product listing. Check the certificate for the approval your site or vessel needs.
What else does safe SCBA use need?
- Training. Every wearer needs to know how to put on, check and use their set before they rely on it. MSA describes the M1 as simple to assemble, put on and train with.
- A good seal. A full face mask only protects if it seals to the face. Our respirator fit guide explains why fit matters as much as the rating.
- Air and cylinder care. Cylinders must be filled with breathing-quality air and inspected and tested as the maker specifies. Follow the service intervals in the manual; MSA lists extended service intervals for the M1.
- Someone outside. In a confined space, entry also needs communication with the worker and a stand-by person who watches conditions in the space, as the confined spaces code sets out.
- A way out. Where people work near a hazard rather than in it, an escape set such as the MSA Lifegard III gives 15 minutes of air to get clear.
Which SCBA suits which job?
- Confined space entry and rescue: the MSA M1 SCBA Compliance Kit (listed for fire service and confined space) or the 3M Scott ProPak-i (listed as suitable for any IDLH environment).
- Ships and marine compliance: the 3M Scott SCBA Marine Compliance Set or the ProPak Sigma.
- Fire services and industrial fire teams: the ProPak-f or ProPak-fx, or the modular MSA M1.
- Escape only: the MSA Lifegard III.
- Spare air: the 3M Scott 1860 (6.8 L) and 2460 (9 L), or MSA carbon fibre cylinders in 4.3, 6.8 or 9.0 L.
Not sure which suits your site? Contact our team with the work and the atmosphere, and we will point you to the right set. The final selection belongs with your site's risk assessment.
Shop SCBA and Breathing Apparatus
Sources: Safe Work Australia: Model Code of Practice, Confined spaces (2024); EN 137:2006, Respiratory protective devices: self-contained open-circuit compressed air breathing apparatus with full face mask (standard summary); and the manufacturer information on each 1st Safety product listing. This guide summarises these sources in our own words. It is general information, not legal advice.
1st Safety is based in Auburn, NSW, and supplies AS/NZS-compliant PPE to trades, construction, and industrial businesses across Australia.
Frequently Asked Questions
What does SCBA stand for?
Self-contained breathing apparatus: a breathing set that supplies air from a compressed-air cylinder the wearer carries, instead of filtering the air around them.
Can I use a P2 or P3 mask instead of SCBA?
Not where the air is short of oxygen. A P2 or P3 respirator filters particles but adds no oxygen. Safe Work Australia's confined spaces code says a worker in a space with less than 19.5% oxygen must be provided with air-supplied respiratory equipment, such as an SCBA or an airline respirator.
How long does an SCBA cylinder last?
It depends on the cylinder and how hard you breathe. The 3M Scott 2460 cylinder (9 L, 300 bar) is rated at a nominal 61 minutes at an air consumption of 40 litres per minute, and the 6.8 L 3M Scott 1860 lists 46 minutes. Hard work shortens these times.
What is the difference between Type 1 and Type 2 SCBA?
The European standard EN 137 splits open-circuit compressed-air SCBA into Type 1 for industrial use and Type 2 for firefighting. The 3M Scott ProPak sets we supply are listed as Type 2.
What is an escape set?
A small breathing set for getting out of a dangerous atmosphere, not for working in it. The MSA Lifegard III holds 3 litres of air at 200 bar and gives 15 minutes of breathing air for escape.
Can you supply SCBA for a whole site or crew?
Yes. Trade pricing and account terms are available, so contact our team or call 0457 545 175. SCBA sets and cylinders are bulky, so extra freight may apply; we'll confirm before shipping.