How To Choose Modular Knockdown Electrical Cabinet ?

How to Choose Modular Knockdown Electrical Cabinet  ？ 

1. Confirm Application & Environment

- Indoor automation / outdoor distribution / corrosive (chemical, marine) / dust / water spray

- Choose IP rating: - Indoor: IP54 - Industrial/dust: IP55 - Outdoor/heavy moisture: IP65–IP66

2. Select Structure Type (Knockdown Modular) Prioritize 9-fold profile steel frame:

- Fully bolted, no welding - Flat-pack shipping, easy on-site assembly

- Strong rigidity, expandable side-by-side Avoid cheap welded semi-modular if you need real knockdown flexibility.

3. Material & Surface Treatment

- Carbon Steel: indoor, cost-effective → epoxy powder coating - 304 stainless steel: outdoor, food, pharmaceutical

- 316 stainless steel: high corrosion 

4. Size & Internal Layout Calculate dimensions (W×D×H) based on:

- Components (PLC, drives, breakers, HMIs)

- Cable entry (top/bottom)

- Heat dissipation

- Reserve 20–30% space for future expansion Common depths: 600 / 800 / 1000 mm

5. Protection & Safety Standards - Comply with IEC 61439, GB 7251, CCC, UL etc. 

6. Cooling & Ventilation

- Fan + filter for general heat

- Heat exchanger / air conditioner for high heat or sealed IP65+

- Ensure no short-circuit between cooling and protection level

7. Transport & Assembly Convenience

- True knockdown: frame, door, panels packed flat

- Simple bolt assembly, no special tools

- Lightweight for logistics cost saving 8. Accessories Matching

- Mounting plate / DIN rails - Cable glands, cable management

- Locks, hinges, viewing window (if needed) - Base frame / plinth