Siemens G1212L1125 Indoor Load Center 100A 120/240VAC 1-Phase Type 1 with Installed Breakers Set

Condition: Used; Was used on a demo stand; light cosmetic wear from prior service, handwritten circuit directory markings, breakers included as specified; verify bus condition, torque, and breaker compatibility per the panel label before energizing.

The Siemens G1212L1125 is an indoor (Type 1) load center intended for 120/240VAC single-phase, 3-wire electrical distribution. It’s commonly installed as a subpanel (fed from a main service panel) to add circuit capacity for garages, basements, workshops, small offices, or mechanical rooms. The steel enclosure with hinged door provides protected breaker access and a built-in circuit directory for organized branch labeling. With a 100A bus rating, it’s well suited for mixed 120V branch circuits plus select 240V loads when properly protected and wired to code.

Model Notes / Quick Decode (G1212L1125)

Exact interpretation varies by Siemens series, but typically:

• G: Siemens load center family/series

• 12/12: often indicates 12 spaces and up to 24 circuits if tandems are permitted (must be confirmed on the factory label)

• L: commonly associated with Main Lug configuration (no factory main breaker), but confirm on the interior nameplate

• 1125: configuration/package identifier

Included Breakers (not tested)

• 1 × 15A, single-pole

• 5 × 20A, single-pole

• 1 × 20A, two-pole

• 2 × 30A, two-pole

Typical use mapping:

• 15A/20A 1-pole: lighting and receptacle branch circuits

• 20A/30A 2-pole: 240V loads such as small HVAC components, pumps, compressors, electric heaters, or dedicated equipment circuits (application depends on nameplate requirements)

Key Features

• 100A class indoor load center for 120/240VAC 1-phase

• Type 1 enclosure for dry indoor locations

• Steel cabinet + hinged door with circuit directory

• Multiple knockouts for top/bottom/side conduit or cable entry

• Neutral and grounding termination provisions (bar style depends on configuration)

• Accepts Siemens-compatible plug-in breakers as listed on the panel label (commonly QP-family, but verify on the nameplate)

Applications

• Residential subpaneling: garage, basement, addition, detached workshop (where allowed), dedicated area circuits

• Light commercial: small office suites, retail back rooms, utility areas

• HVAC/mechanical rooms: air handler circuits, control power, pumps, ventilation equipment, auxiliary circuits

• General power distribution: organized branch protection and load management

Where It Fits in a Larger Electrical System

Common integration:

• Main service panel / disconnect → feeder breaker → feeder conductors → this load center → branch circuits
  Important practice notes:

• When used as a subpanel, neutral and ground must be isolated (bonding done only at the service disconnect), unless local code and listing state otherwise.

• Feeder overcurrent protection is typically provided by the upstream breaker sized to the feeder conductors.

Cross-Referenced Models (Comparable Class)

(Comparable by use case; not guaranteed direct replacements—match spaces/circuits, main type, bus rating, and breaker compatibility.)

• Siemens indoor load centers in G / EQ families (similar 100A class)

• Square D Homeline or QO indoor load centers

• Eaton / Cutler-Hammer BR or CH indoor load centers

• GE indoor load centers using THQL/THQP ecosystems

• Leviton indoor load centers (different breaker ecosystem)

Comparable Products

• Siemens 100A indoor main-lug subpanel (similar space/circuit count)

• Eaton BR 100A indoor load center

• Square D Homeline 100A indoor load center

• GE 100A indoor load center

Recommended Pre-Install Checks (Especially for Used Panels)

• Confirm exact catalog data and allowable breaker types on the factory label

• Inspect bus stabs for overheating, pitting, or looseness

• Confirm neutral/ground bars and bonding hardware are correct for your configuration

• Verify breaker types are listed for this panel and operate properly

• Re-torque lugs/terminals to label specifications after installation

Related

• “Siemens 100 amp load center”, “indoor breaker panel Type 1”, “120/240V single phase subpanel”, “main lug load center”, “12 space panelboard”, “branch circuit distribution panel”, “breaker box with door”, “electrical distribution enclosure”, “garage/workshop subpanel”, “panel with 15A 20A 30A breakers”

Common Requests:

1. “Which breaker series fits Siemens G1212L1125 load center?”

2. “100A 120/240V single-phase indoor subpanel for garage/workshop”

3. “How to tell main lug vs main breaker on Siemens load center?”

4. “Neutral/ground isolation rules for subpanels (Siemens load center)”

5. “Are tandem breakers allowed in a 12-space Siemens panel (label check)?”

P126; B010; GT00160