1. Distribution Box Model Naming Rules (the prefix defines the cabinet type)
A domestic distribution box model number = cabinet type prefix + design sequence number + specification. The prefix defines the cabinet type: PZ30 = terminal combination apparatus, XL = power distribution cabinet, GGD = fixed low-voltage cabinet, JP = integrated distribution box.
2. Mainstream Model Comparison Table (8 cabinet types)
| Model | Type | Typical applications | Notes |
|---|---|---|---|
| PZ30 | Final distribution boards | End-stage distribution for homes and offices | Modular DIN rail |
| XL-21 | Power distribution cabinets | Workshop power distribution | Fixed type |
| JP | Integrated distribution box | Rural grid / distribution area | Metering + power factor correction + distribution |
| GGD | Fixed low-voltage cabinet | Main cabinet in the distribution room | Fixed type |
| GCS | Drawer-type low-voltage cabinet | Industrial power distribution | Drawers removable |
| MNS | Drawer-type low-voltage cabinet | Large projects / foreign-invested plants | ABB platform |
| XGM | Lighting distribution boxes | Corridor lighting | Modular |
| PT | Voltage transformer cabinet | HV metering / protection | PT fitted |
3. PZ30 or XL-21 — how to choose? (Residential vs. workshop)
PZ30 = Residential / office final distribution(≤ 63A, modular miniature circuit breakers); XL-21 = Workshop power distribution(≤ 630A, molded case circuit breakers). Choose PZ30 for residential, XL-21 for workshops — do not mix them.
4. What is a JP cabinet? (integrated distribution box)
JP cabinet = metering + power factor correction + distributionthree-in-one, standard equipment for rural grid distribution areas. It contains a kWh meter, current transformers, capacitor compensation and outgoing circuit breakers, and is installed outdoors on a floor-mounted base. Zhejiang Golden Unicorn produces 500+ JP cabinets per year.
5. Three questions to ask when selecting (power / circuits / environment)
- How much power— determines the incoming switch and busbar rating
- How many circuits— determines the number of outgoing circuit breakers and the enclosure size
- Indoor or outdoor— determines the ingress protection (IP) rating: IP54 / IP65
FAQ FAQ
What is a PZ30 distribution box?
A terminal modular distribution box for residential / office final distribution, ≤ 63A, fitted with miniature circuit breakers.
What is the difference between XL-21 and GGD?
XL-21 is a power distribution cabinet (workshop distribution, ≤ 630A); GGD is a low-voltage main cabinet (distribution room, ≤ 2000A) with higher capacity.
Can a JP cabinet be used indoors?
JP cabinets are designed for outdoor distribution areas. They can be used indoors, but the IP rating is wasted — for indoor use, choose GGD or XL-21.
What do the numbers in the model suffix mean?
Usually a design sequence number or specification code — for example, GGD-2 indicates the second design variant. Check the manufacturer's catalog for details.
Related pages:Technical notes · Products · Industries · Resource center · FAQ · Get a quote