Where should I install a load break switch?

Load break switch installation locations:

• Main distribution board (MDB) position : Immediately downstream of utility metering/main breaker. LBS serves as primary isolation for entire installation. Allows electrician to safely disconnect all circuits for maintenance without facility shutdown.
• Feeder circuit isolation : Individual LBS on each major feeder (e.g., separate switchboards for HVAC zone, production line, data center UPS circuit). Enables selective system maintenance without total facility blackout.
• Motor circuit protection : LBS upstream of motor starter (contactor + overload relay). Allows safe motor replacement, bearing servicing, coupling adjustment. Prevents unexpected motor restart during maintenance.
• Backup generator load transfer : LBS between automatic transfer switch (ATS) and main distribution. Manual isolation point if ATS requires repair; enables manual generator operation via simple handle operation.
• Cabinet layout : Mount on DIN rail or panel immediately adjacent to main circuit breaker. Minimum clearance 200mm for safe handle operation (left/right rotation 90°).
• Visibility requirement : Install LBS where operator can see position (ON/OFF) at glance. Avoid mounting inside cabinet where visibility blocked by other components.
• Height accessibility : Install handle height 1.2–1.8m from floor (ergonomic reach). Too high risks accidents; too low invites unintended operation.
• Load rating match : Select LBS current rating ≥ installation maximum demand. Example: 100A main breaker requires minimum 100A LBS. Oversizing acceptable (630A LBS suitable for 100A feeder).

IEC 61439-1 switchboard standard mandates primary isolation point. Socomec LBS placement per IEC 60204-1 machine safety / EN 60950 equipment safety. Optim-Elec designs switchboard single-line diagrams indicating LBS positions. Contact optim-elec.com for layout guidance.