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: “Which breaker series fits Siemens G1212L1125 load center?” “100A 120/240V single-phase indoor subpanel for garage/workshop” “How to tell main lug vs main breaker on Siemens load center?” “Neutral/ground isolation rules for subpanels (Siemens load center)” “Are tandem breakers allowed in a 12-space Siemens panel (label check)?”   P126; B010; GT00160