Branch Circuit Monitoring System for Panelboards

A branch circuit monitoring system (BCM or BCMS) gives you visibility into every breaker in a panel board — current, power, energy, and how close a circuit is to trip. This article stays on panel-board applications: new construction and retrofits, typically 42 circuits and above on a single architecture. Solid-core CTs favor new builds. Split-core CTs favor live retrofits. Product names below link to the manufacturer line. Setup and install how-tos will be added later.

Why panel-board BCMS is its own category

Lighting and appliance panel boards have long been designed around 42 overcurrent devices. That count still drives how BCM hardware is packaged: 21-circuit strips on each side, 42-circuit kits, 84-circuit boards that cover two rows or two panels. If a meter cannot cleanly cover a 42-circuit panel with solid-core or split-core options, it belongs in a later article on general sub-metering — not here.

Solid core vs. split core

Solid-core CTs

The conductor must pass through a closed ring before it lands on the breaker. That is the right choice when the panel is still being built. Strips are spaced to match 3/4 inch, 1 inch, or 18 mm breaker centers. Accuracy is typically the tightest of the two styles because there is no air gap in the core. Cost per point is usually lower on a new assembly.

Split-core CTs

The sensor opens and clamps around an existing conductor. No shutdown, no pulling wire, no re-landing every breaker. That is the retrofit path for occupied data halls and commercial buildings. There is a small accuracy trade-off from the hinge gap, but modern systems still land in Class 1 / ANSI C12.20 0.5% territory when the meter and CTs are treated as a set.

Active brands for North American panel boards

Schneider Electric

The PowerLogic BCPM monitors up to 84 branch circuits plus mains. Solid-core strips suit new PDUs and RPPs. The BCPMSC split-core family is the retrofit option. Class 1 system accuracy with 50 A or 100 A branch CTs. Modbus RTU is standard; Ethernet models add Modbus TCP, BACnet, and SNMP.

Eaton

The Power Xpert Branch Circuit Monitor (PXBCM) is the Eaton / PDI-style panel-board BCM. Meter module strips with solid-core CTs fit Pow-R-Line 1a, 2a, and 3e interiors at 1-inch spacing up to 100 A. External modules with 333 mV split-core sensors handle retrofits and larger feeders. ANSI C12.20 0.5% accuracy. One meter base can take four strips — 84 branches plus auxiliary mains inputs.

The Eaton PDI WaveStar line is the factory BCM on PDI PDUs and RPPs, not a generic panel-board strip meter. A BCMS data-acquisition board covers two 42-pole panelboards or one 84-pole board plus the associated mains. Branch CTs are rated to 100 A and report demand and peak current, real and apparent power, kWh, and signed power factor. Mains and subfeeds take CTs from 100 A to 3200 A. The WaveStar Color Monitor (7-inch touchscreen on the gear) can display up to four panelboards locally, or up to twenty BCMS devices on the Modbus chain. Upstream links are Modbus RTU, Modbus TCP, and SNMP. For a hall-wide view, the WaveStar BCMS Hub aggregates as many as 70 panelboards or busway devices on a 10.4-inch display. New PDI gear uses factory-fit CTs. Existing RPPs, PDUs, and third-party panelboards use the JCOMM retrofit kit: split-core 5–250 A branch CTs, pre-wired harnesses, and the same BCMS board so you do not pull conductors on a live board.

Anord Mardix

The Modular Circuit Monitoring System (MCMS) uses a Core Module gateway with up to four interface boards and 96 circuits. Solid-core panel strips are for new boards (up to 21 circuits per strip plus auxiliaries). A floating split-core strip with quick-connect 10 mm CTs sits on existing conductors for retrofit. Optional voltage-presence detection reads breaker status even at no load.

Packet Power

Packet Power BGP monitors are wired at the CT harness and wireless from the panel to the gateway. BGP64 covers a typical 42/48-pole side-by-side panel (32–64 CTs). BGP128 and BGP192 stack two to four panels. Pre-wired split-core harnesses are the retrofit default; solid-core CTs are available. Data leaves on a mesh and lands as Modbus, BACnet, SNMP, MQTT, or EtherNet/IP at the gateway — no home-run comms cable to every panel.

ABB Cyberex BCMS

Cyberex PowerView / Circuit Management is factory-fit on Cyberex PDUs and RPPs and also sold as a retrofit. One module can cover up to four 42-circuit panel boards (168 poles). Split-core CTs clamp onto existing branch conductors without pulling breakers. Core and Pro tiers cover current-only through full power and energy. Modbus RTU and Modbus TCP feed BMS or a local display.

Cortex System

Cortex System is listed here as an active panel-board BCM option in the same 42-circuit-and-up class. Use it when the project already standardizes on that platform. The CSM-1-00 and CSM-2-00 support solid-core and split-core applications. Multiple protocols supported for integration to BAS, BMS, EPMS and DCiM applications.

Other active brands worth knowing

• Siemens SEM3 — modular racks, 45 modules per controller, solid- and split-core CTs from 50 A to 2000 A, 1% or 0.2% ANSI C12.20 modules, factory-fit in Siemens boards or retrofit enclosures.
• Leviton VerifEye Series 7000 / 7100 — 24- and 48-circuit boards with split-core or Rogowski CTs. Useful when the panel is smaller than a full 84-circuit PDU row.

Legacy — older technology brands

These still show up in existing rooms. Plan replacements around split-core kits so you do not shut the panel down.

• Veris H663 — original Veris panel BCM. Discontinued. E30 / E31 were the replacement path.
• Veris E31 (current split-core line) and Veris E30 (solid-core strips) — up to 84 branches plus mains and neutrals; one board can cover two panels. Still a common independent choice in mixed-brand rooms.
• Older Square D / PowerLogic BCM42-style strip systems and early PDI branch monitors — treat as legacy; map them to BCPM or PXBCM when you refresh.

How to choose

1. New panel: specify solid-core strips in the panel-board section so the assembly stays one listing.
2. Existing panel: specify split-core. Do not plan a solid-core pull-through on a live board.
3. Circuit count: stay at 42 or more per unit. Below that, save it for a later sub-metering article.
4. Accuracy: solid-core for the tightest reading; split-core when uptime matters more than a fraction of a percent.
5. Integration: Modbus at minimum. Add BACnet, SNMP, or wireless mesh if the BMS or DCIM needs it.

Bottom line

Panel-board BCMS is a CT decision first and a brand decision second. Solid core for new construction. Split core for retrofits. Schneider Electric, Eaton, Anord Mardix, Packet Power, ABB Cyberex, Cortex System, Siemens SEM3, and Legacy Veris E30/E31 lines all cover a real 42-circuit panel. The H663 and early strip systems are replacement candidates, not new-spec products.