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NEMA BI 50009-2024 Low Voltage Cartridge Fuses, 2024
- NEMA BI 50009-2024 [Go to Page]
- National Electrical Manufacturers Association
- Section 1 GENERAL [Go to Page]
- 1.1 Scope
- 2.1 Definitions
- Section 3 SERVICE CONDITIONS [Go to Page]
- 3.1 Usual Service Conditions
- 3.2 Unusual Service Conditions
- Section 4 RATINGS [Go to Page]
- 4.1 Current Ratings of Non-Time-Delay Fuses [Go to Page]
- Table 4-1
- Current Ratings of Non-Time-Delay Fuses
- 4.2 Current Ratings of Time-Delay Fuses [Go to Page]
- Table 4-2
- Current Ratings of Time-Delay Fuses
- 4.3 AC Voltage Ratings [Go to Page]
- Table 4-3
- AC Voltage Ratings—Time-Delay and Non-Time-Delay Fuses
- 4.4 DC Voltage Ratings [Go to Page]
- Table 4-4
- DC Voltage Ratings—Time-Delay and Non-Time-Delay Fuses
- 4.5 AC Interrupting Ratings [Go to Page]
- Table 4-5
- AC Interrupting Ratings—Time-Delay and Non-Time-Delay Fuses
- 4.6 DC Interrupting Ratings [Go to Page]
- Table 4-6
- DC Interrupting Ratings—Time-Delay and Non-Time-Delay Fuses
- 4.7 Frequency Rating
- Section 5 FUSE CLASSES [Go to Page]
- 5.1 Summary of Fuse Classes
- 5.2 Class G Fuses (Current Limiting) 0–60 Amperes, 480 V and 600 V, Alternating Current
- 5.3 Class H Fuses 0–600 Amperes, 250 V and 600 V, Alternating Current
- 5.4 Class J Fuses (Current Limiting) 0–600 Amperes, 600 V, Alternating Current
- 5.5 Class K Fuses 0–600 Amperes, 250 V and 600 V, Alternating Current
- 5.6 Class L Fuses (Current Limiting) 100–6000 Amperes, 600 V, Alternating Current
- 5.7 Class R Fuses (Current Limiting) 0–600 Amperes, 250 V and 600 V, Alternating Current
- 5.8 Class T Fuses (Current Limiting) 0–1200 Amperes, 300 V and 600 V Alternating Current
- 5.9 Class CC Fuses (Current Limiting) 0–30 Amperes, 600 V, Alternating Current
- 5.10 Class C Fuses (Current Limiting) 0–1200 Amperes, 600 V, Alternating Current
- 5.11 Class CA (Current Limiting) 0–30 Amperes, 600 V, Alternating Current
- 5.12 Class CB (Current Limiting) 0–60 Amperes, 600 V, Alternating Current
- 5.13 Fuses for Photovoltaic Systems PV Fuses [Go to Page]
- Table 5-1
- Summary of Fuse Classes and Alternating Current Ratings*
- Table 5-2
- Dimensions of Class G Fuses, mm (in.)
- Table 5-3
- Dimensionsa of Class H and K Fuses, mm (in.)
- Table 5-4
- Dimensionsa of Class J Fuses, mm (in.)
- Table 5-5
- Dimensionsa of Class L Fuses, mm (in.)
- Table 5-6
- Dimensionsa of Ferrule Type Class R Fuses, mm (in.)
- Table 5-7
- Dimensionsa of Knife Blade Type Class R Fuses, mm (in.)
- Table 5-8
- Dimensionsa of Ferrule Type Class T Fuses, mm (in.)
- Table 5-9
- Dimensionsa of Knife Blade Type T Fuses, mm (in.)
- Table 5-10
- Dimensionsa of Class CC Fuses, mm (in.)
- Table 5-11
- Dimensions of Class C Fuses, mm (in.)
- Table 5-12
- Dimensions of Class CA Fuses, mm (in.)
- Table 5-13
- Dimensions of Class CB Fuses, mm (in.)
- Section 6 PERFORMANCE [Go to Page]
- 6.1 General
- 6.2 Current Carrying Capacity and Temperature Rise Tests [Go to Page]
- Table 6-1
- Maximum Temperature Rises
- (Classes C, H, J, K, R, and T Fuses)
- Table 6-2
- Maximum Temperature Rises
- (Classes CA, CB, CC, and G Fuses)
- Table 6-3
- Test Conductor Size
- Table 6-4
- Bus Bar Cross-Section and Shorting Bar Temperature Rises
- 6.3 Overload Opening Time [Go to Page]
- Table 6-5
- Classes CA, CB, CC, and G Fuses
- Table 6-6
- Overload Opening Time
- Classes H, J, K, L, R, and T Fuses
- 6.4 Interrupting Tests at Rated Voltage [Go to Page]
- Table 6-7
- Test Levels for High Interrupting Rating Fuses (Above 10 kA)
- Table 6-8
- Class CC Fuses (600 V)
- Maximum Peak Let-Through Current Ip (Amperes) and Clearing I2t
- (Amperes Squared Seconds)
- Table 6-9
- Class G Fuses
- Maximum Peak Let-Through Current Ip (Amperes) and Clearing I2t
- (Amperes Squared Seconds)
- Table 6-10
- Class J Fuses (600 V)Maximum Peak Let-Through Current Ip (Amperes)
- and Clearing I2t
- (Amperes Squared Seconds)
- Table 6-11A
- Class K Fuses (250 & 600 V)
- Maximum Peak Let-Through Current Ip (Amperes)
- and Clearing I2t
- (Amperes Squared Seconds) at 50 and 100 kA
- Table 6-11B
- Class K Fuses (250 & 600 V)
- Maximum Peak Let-Through Current Ip (Amperes) and Clearing I2t
- (Amperes Squared Seconds) at 200 kA
- Table 6-12
- Class RK1 Fuses (250 & 600 V)
- Maximum Peak Let-Through Current Ip (A) and Clearing I2t
- (Amperes Squared Seconds)
- Table 6-13
- Class RK5 Fuses (250 & 600 V)
- Maximum Peak Let-Through Current Ip (Amperes)
- and Clearing I2t (Amperes Squared Seconds)
- Table 6-14
- Class L Fuses (600 V)
- Maximum Peak Let-Through Current Ip (Amperes) and Clearing I2t
- (Amperes Squared Seconds)
- Table 6-15
- Class T Fuses (300 V)
- Maximum Peak Let-Through Current Ip (Amperes) and Clearing I2t
- (Amperes Squared Seconds)
- Table 6-16
- Maximum Peak Let-Through Current Ip (Amperes) and Clearing I2t
- (Amperes Squared Seconds)
- Table 6-17
- Maximum Peak Let-Through Current Ip (Amperes)and Clearing I2t
- (Amperes Squared Seconds)
- Table 6-18
- Class CA and Class CB Fuses
- Maximum Peak Let-Through Current Ip (Amperes) and Clearing I2t
- (Amperes Squared Seconds)
- 6.5 Maximum Energy
- 6.6 Maximum Threshold Ratio [Go to Page]
- Table 6-19
- Maximum Threshold Ratios
- 6.7 Direct Current Tests for Industrial Fuses [Go to Page]
- Table 6-20
- Maximum Time Constants
- 6.8 Direct Current Tests for Photovoltaic Fuses [Go to Page]
