How an Electronics Manufacturer Reduced Downtime by 40% with SINGI RCBOs

Customer Background

A mid-sized electronics contract manufacturer based in Dongguan, Guangdong Province, with 800 employees, produces PCBA assemblies for household appliances. Annual revenue is $50 million. The plant operates 24/7 with over 200 automated pick-and-place machines, wave soldering lines, and testing stations.

Challenges & Pain Points

The original electrical distribution relied on separate MCBs and RCDs. Due to high harmonic currents from switching power supplies and motor drives, the standard RCDs triggered nuisance tripping — up to 15 unplanned shutdowns per month. Each incident required a 30-minute reset and inspection, costing roughly $2,400 in lost production per hour., three electric shock near-misses were recorded in the previous year from leakage in wet areas.

Why Choose SINGI RCBOs

The plant assessed replacing RCDs with type A/type B units, but panel space was limited for separate devices. They considered brands like Schneider and ABB, but the cost was 30% higher. SINGI RCBOs offered a compact solution combining overcurrent, short-circuit, and residual amperage protection (type A, 30mA) in one module. After on-site testing of 50 units over one month, zero nuisance trips occurred, convincing the team.

Implementation & Application

The project spanned 6 weeks. Key steps:

1. Audit: Mapped 180 critical circuits in power distribution panels.
2. Specification: Chosen SINGI RCBO with Icn=10kA, In=63A, type A, 30mA sensitivity.
3. Installation: Replaced existing MCB+RCD pairs with single SINGI RCBOs in ten distribution boards.
4. Testing: Verified trip times (<40ms at 5Idn) and coordination with upstream MCCBs.

One challenge: older panels had busbar pitch mismatch requiring custom adapters, but SINGI provided compatible busbars at no extra cost.

Quantified Results

• Unplanned downtime reduced from 7.5 hours/month to 1.2 hours/month (84% reduction).
• Annual savings: $120,000 from lost production, $15,000 in maintenance labor.
• Electric shock incidents: zero in the following 12 months.
• Panel space freed: 40% less space required, enabling future expansion without new panels.

Customer Voice

"We were skeptical at first, but the RCBOs solved our nuisance trip problem on day one. The payback period was less than 4 months considering downtime savings." — Facility Manager, Dongguan Electronics Co.

Lessons & Takeaways

• Match residual amperage type to load: Use type A or B in electronics environments to avoid nuisance trips.
• Compact design matters: RCBOs save panel space and simplify wiring, reducing installation errors.
• Test before full rollout: A pilot installation on a few critical circuits validates performance.

References:
1. GB/T 6829-2017. Residual amperage operated circuit-breakers with or without overamperage protection for household and similar uses (RCBOs) [S]. 2017.
2. Chen G, Mou X. Study on the coordination between MCB and RCBO in low-volt-level power distribution systems [J]. Electrical Engineering, 2022, 104(3): 1823-1835.