What is the difference in application between GPO-3 and GPO-1?

The GPO1 and GPO3 you mentioned, also known as GPO-1 (UPGM201) and GPO-3 (UPGM203), are both unsaturated polyester glass fiber felt laminates commonly used in the power industry as insulation materials. The core differences between the two are concentrated in electrical performance, flame retardant rating, and application scenarios. Below is a clear breakdown for you:
🔍 Comparison Table of Core Differences
Comparison dimension GPO-1 (UPGM201) GPO-3 (UPGM203)
Performance positioning: General economic insulation material, high-performance power specific insulation material
The electrical performance only meets the basic insulation requirements, and the arc resistance and anti tracking performance are generally excellent. The arc resistance (≥ 180s) and anti tracking performance (CTI ≥ 600V) are generally excellent, and the electrical stability is excellent in high humidity environments
The flame retardant level is usually UL94 V-1, and the flame retardant performance generally reaches UL94 V-0. It has strong self extinguishing ability and no dripping, making it a mandatory flame retardant level for power equipment
The heat resistance level is mostly B level (130 ℃) and F level (155 ℃), and the performance is stable under long-term high temperature environment
Mechanical performance meets higher bending and compressive strength requirements for basic structural support, with better impact and cracking resistance
Applicable scenarios: Low voltage equipment, insulation of non critical parts, high voltage switchgear in ordinary mechanical support components, circuit breaker partitions, transformer insulation components, rail transit power equipment, wind/photovoltaic combiner boxes
Low cost, suitable for budget sensitive projects with high costs, belonging to high-performance power specific materials
Industry standards meet the general insulation board standards and comply with NEMA GPO-3 standards, making it the mainstream choice in the power industry
💡 Key Details Explanation
1. Formula and process differences - GPO-1 is a universal formula, and the resin system and additives only meet basic performance requirements;
-GPO-3 has added specialized flame retardants and arc resistant additives to the resin, and the impregnation process of glass fiber felt is also more stringent, ensuring stability under complex working conditions of power equipment.
2. Core performance watershed: arc resistance and flame retardancy
This is the most crucial difference between the two: - GPO-3 has an arc resistance time of over 180 seconds, which can withstand the arc impact during the opening and closing of power equipment, avoiding insulation breakdown and fire;
-However, GPO-1 cannot meet the arc protection requirements of medium and high voltage equipment, and once an arc occurs, it is highly likely to cause safety accidents.
3. Selection suggestion - For low voltage, non critical parts, and scenarios without mandatory flame retardant requirements, GPO-1 can be chosen to control costs;
-High voltage power equipment, public distribution facilities, rail transit, and new energy equipment must use GPO-3, which is a mandatory requirement of industry safety regulations.