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A 200 amp meter main combo combines the utility meter socket and the home’s main breaker in one outdoor enclosure that cuts power to the house.
Order the wrong meter combo and it sits in the garage. The utility rejects the cover style, the inspector fails the feed direction, and the supply house won’t take it back once the packaging is open.
What a 200 amp meter main combo is and how it works traces back to two halves sharing one outdoor service-entrance assembly rated 200 A, single-phase, 120/240 V. The meter socket is the utility’s side: it measures the power the house uses and stays sealed under utility control. The main breaker or disconnect is the homeowner’s side — flip it and every circuit downstream goes dead. Which half a problem lives in decides whether you call an electrician or the utility.
What Does A Meter Main Combo Do?
A meter main combo does two jobs in one outdoor enclosure: it holds the utility’s meter socket, which measures power use, and it holds the main breaker or disconnect, which shuts off power to the service and everything downstream of it.
The two halves belong to different owners, and that shapes how the box gets used. The meter socket stays sealed — the utility pulls the meter for service work, and breaking that seal is not the homeowner’s job. The main disconnect is the homeowner’s switch. A contractor doing interior work flips it to kill the panel; the utility can also use it to isolate the service.
Everything here is sized for standard residential service: 200 A, single-phase, 120/240 V. The enclosure carries a NEMA 3R rating so rain and snow stay out, and the assembly mounts at the service entrance, where the utility’s drop or lateral meets the house. Siemens lists 200 A meter-combo models for one-phase residential service, and ABB describes the same product category.
A load center is a different product — just a breaker box, with no meter socket and no utility seal. A meter main combo replaces both the meter can and the main disconnect, and many models add branch breaker spaces on top of that: 8 spaces and 16 circuits on the smaller units, then 20 spaces and 40 circuits, 24 spaces and 42 circuits, or 30 spaces and 42 circuits on the larger ones.
Choosing A 200 Amp Meter Combo: What Has To Match Your Service
Three details decide which 200 A meter combo a house can use: the meter cover style, the direction the service conductors arrive, and the bypass provisions the local utility demands.
| Feature | What You’ll See | Why It Matters |
|---|---|---|
| Meter cover | Ring or ringless | Many utilities require ringless for residential service |
| Service feed | Overhead or underground | Must match how the utility’s conductors arrive |
| Main rating | 200 A, 1-phase, 120/240 V | The standard residential service size |
| Breaker spaces | 8/16, 20/40, 24/42, 30/42 | Spare spaces cost less now than a subpanel later |
| Bypass | Fifth terminal and bypass horns | Lets utility crews bypass the meter manually |
| Enclosure | NEMA 3R outdoor rating | Rain-tight housing for service-entrance mounting |
| Mounting | Surface mount | Square D’s listed unit is a surface-mount 40-circuit CSED |
Cover style stops the most orders. AEP Ohio’s meter main and combo standard requires ringless meter mains and combinations for residential sites, so a ring-style unit can be refused even though it is a well-made product. Feed direction matters next — overhead and underground versions are different catalog numbers, and the Siemens submittal sheets spell out per-model differences in bypass type and incoming arrangement.
On bypass, that same AEP Ohio standard says 125 A and 200 A four-terminal meter mains and combos need provisions for a fifth terminal and bypass horns so crews can bypass the meter by hand. A 200 A five- or seven-terminal unit, and every 320 A meter main, requires a 100% rated manual bypass instead.
Catalog numbers spread wide, from Siemens MM0202B1200 and MC0816B1200TH to Square D SO2040VP and Leviton LS820-BLD. A tested roundup of 200 amp meter mains sorts them by spaces, bypass, and feed type before you order. Price tracks configuration more than brand — one retailer listing shows the Leviton LS820-BLD at $493.50.
Where Meter Combo Installations Go Wrong
The most expensive mistake is assuming every 200 A combo is interchangeable. Each catalog number fixes its own bypass type, feed arrangement, and cover style, so the box has to be chosen against the service design rather than picked off a shelf by amp rating alone.
- Confusing a meter main combo with a plain load center. A load center has no meter socket, and swapping one for the other reworks the entire service entrance.
- Buying a ring-style unit where the utility wants ringless. AEP Ohio requires ringless for residential sites, and every utility keeps its own approved equipment list.
- Ordering an underground model for an overhead service, or the reverse. Those catalog suffixes are not cosmetic.
- Skipping the utility’s approved list. Acceptance is granted locally, and AEP Ohio ties residential use to approval by local supervision.
Run these checks in order before you buy:
- Pull the utility’s approved meter-main list and confirm residential acceptance.
- Confirm the required cover style — ringless, in many jurisdictions.
- Match the feed: overhead or underground, per the actual service.
- Match bypass provisions to the amp rating and terminal count.
- Only then compare spaces, circuits, and price across catalog numbers.
FAQs
Is a meter main combo the same as a main breaker panel?
No. A load center, often called a main breaker panel, holds branch
