BY06H-125 MCB 10-15KA Miniature Circuit Breaker
BY06-125 MCB 6KA Miniature Circuit Breaker
BY05H-40 MCB Single Modular 6KA Miniature Circuit Breaker
BY05-32 MCB Single Modular 3KA Miniature Circuit Breaker
BY04-63 MCB 6-10KA Miniature Circuit Breaker
BY03H-63 MCB 6KA Miniature Circuit Breaker
BY03-63 MCB 4.5KA Miniature Circuit Breaker
BY02-63 MCB 3kA Miniature Circuit Breaker
BY01-63 MCB 3kA Miniature Circuit Breaker
OF SD MX OF MCB Miniature Circuit Breaker Accessories
BYG1-125 Main Switch MCB Isolator Switch
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BY05HL-40 RCBO 6KA Residual Current Circuit Breaker with Over-current Protection
BY05L-32 RCBO 3KA Residual Current Circuit Breaker with Over-current Protection
BY04L-63 RCBO 6KA Residual Current Circuit Breaker with Over-current Protection
BY03L-63 RCBO 4.5KA Residual Current Circuit Breaker with Over-current Protection
BY02L-63 RCBO 3KA Residual Current Circuit Breaker with Over-current Protection
BY01L-63 RCBO 1P+N 3KA Residual Current Circuit Breaker with Over-current Protection
BYVP1-63 100A Single Display Overvoltage and Undervoltage Protector
BYVP2-63 40A 63A Adjustable Dual Display Overvoltage and Undervoltage Protector
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BY08 1+2-12.5 SPD Class T1+T2 Imax 60KA Surge Protective Device
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BY19G 63A Manual Changeover Switch
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BY06-125DC MCB 6kA DC Miniature Circuit Breaker
BY04-63DC MCB 6-10kA DC Miniature Circuit Breaker
BY03H-63DC MCB 6kA DC Miniature Circuit Breaker
BY03-63DC MCB 4.5kA DC Miniature Circuit Breaker
BY02-63DC MCB 3kA DC Miniature Circuit Breaker
BY01-63DC MCB 3kA DC Miniature Circuit Breaker
BYF-63 RCD 10KA Type B AC+A+Smoothing DC Residual Current Device
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BYPV-63 1500VDC 50A Fuse Holder with 10x85mm 14x85mm Fuse Link
BYPV-30 1000VDC 32A Fuse Holder with 10x38mm Fuse Link
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BYPV-ELR1 PV Isolator Switch with Enclosed Version
BYPV-NL1/T PV Isolator Switch with Ultra-thin Lever Handle
BYPV-NL1 PV Isolator Switch with Lever Handle
BYPV-L1/L2 PV Isolator Switch with Lockable Lever Handle
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PV-BY-02 30A/50A 1500V Photovoltaic Connector
PV-BY-03 30A/50A 1000V Panel Mount Photovoltaic Connector
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BYQ1 ATS Mini Type CB Level Dual Power Automatic Transfer Switch
Stainless Steel Hinge Type Electrical Box
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How to Select Definite Purpose Contactor?
Choosing the right BYSON definite purpose contactor requires consideration of parameters, application requirements, safety standards, and brand-specific features. Below is a step-by-step guide to help you make the best selection.
What is a Definite Purpose Contactor:
A definite purpose contactor is an electrically operated switch designed for specific, high-volume applications — most commonly in HVAC (Heating, Ventilation, Air Conditioning) , refrigeration, and food service equipment.
Common Specifications:
| Parameters | Description | Values |
| Full Load Current Inductive (FLA) | Continuous current the contactor can carry while the motor runs normally. Contactor FLA must be ≥ motor FLA. | Residential AC: 25A, 30A, 40A Commercial equipment: up to 90A or higher |
| Locked Rotor Current (LRA) | Peak inrush current the contactor must handle when the motor starts (usually 5–6× FLA). Contactor LRA must be ≥ motor LRA. | In a 240V system, LRA is often 6 times the FLA. |
| Coil Voltage | Control voltage that energizes the contactor. | Common for residential use: 24VAC, 120VAC, 208/240VAC |
| Poles Number | How many circuits the contactor switches. | 1P, 2P (most common for residential AC), 3P, 4P |
How to Choose BYSON ATS:
| Model | Contactor Form Per Circuit | Full Load Current Inductive | Locked Rotor Current | Resistive Amps Rating | Nominal Coil Voltage | ||
| BS-1.5-20A | 1 Pole NO with Shunt | 20A | 120A@240VAC-277VAC | 100A@480VAC | 80A@600VAC | 30A | 24VAC 120VAC 208/240VAC 277VAC |
| BS-1.5-25A | 25A | 150A@240VAC-277VAC | 125A@480VAC | 100A@600VAC | 35A | ||
| BS-1.5-30A | 30A | 180A@240VAC-277VAC | 150A@480VAC | 120A@600VAC | 40A | ||
| BS-1.5-40A | 40A | 240A@240VAC-277VAC | 200A@480VAC | 160A@600VAC | 50A | ||
| BS-2P-20A | 2 Poles NO | 20A | 120A@240VAC-277VAC | 100A@480VAC | 80A@600VAC | 30A | |
| BS-2P-25A | 25A | 150A@240VAC-277VAC | 125A@480VAC | 100A@600VAC | 35A | ||
| BS-2P-30A | 30A | 180A@240VAC-277VAC | 150A@480VAC | 120A@600VAC | 40A | ||
| BS-2P-40A | 40A | 240A@240VAC-277VAC | 200A@480VAC | 160A@600VAC | 50A | ||
| BS-2P-50A | 50A | 300A@240VAC-277VAC | 250A@480VAC | 200A@600VAC | 60A | ||
| BS-2P-60A | 60A | 360A@240VAC-277VAC | 300A@480VAC | 240A@600VAC | 75A | ||
| BS-2P-75A | 75A | 450A@240VAC-277VAC | 375A@480VAC | 300A@600VAC | 90A | ||
| BS-2P-90A | 90A | 540A@240VAC-277VAC | 450A@480VAC | 360A@600VAC | 120A | ||
| BS-3P-20A | 3 Poles NO | 20A | 120A@240VAC-277VAC | 100A@480VAC | 80A@600VAC | 30A | |
| BS-3P-25A | 25A | 150A@240VAC-277VAC | 125A@480VAC | 100A@600VAC | 35A | ||
| BS-3P-30A | 30A | 180A@240VAC-277VAC | 150A@480VAC | 120A@600VAC | 40A | ||
| BS-3P-40A | 40A | 240A@240VAC-277VAC | 200A@480VAC | 160A@600VAC | 50A | ||
| BS-3P-50A | 50A | 300A@240VAC-277VAC | 250A@480VAC | 200A@600VAC | 60A | ||
| BS-3P-60A | 60A | 360A@240VAC-277VAC | 300A@480VAC | 240A@600VAC | 75A | ||
| BS-3P-75A | 75A | 450A@240VAC-277VAC | 375A@480VAC | 300A@600VAC | 90A | ||
| BS-3P-90A | 90A | 540A@240VAC-277VAC | 450A@480VAC | 360A@600VAC | 120A | ||
| BS-4P-25A | 4 Poles NO | 25A | 150A@240VAC-277VAC | 125A@480VAC | 100A@600VAC | 30A | |
| BS-4P-30A | 30A | 180A@240VAC-277VAC | 150A@480VAC | 120A@600VAC | 40A | ||
| BS-4P-40A | 40A | 240A@240VAC-277VAC | 200A@480VAC | 160A@600VAC | 50A | ||
Note:
A definite purpose contactor from one brand may look identical to another brand's model but have different LRA ratings. Always match by FLA, LRA, coil voltage, and poles number. When replacing a contactor, you cannot simply match its size or ampere rating to a different brand or type. DP contactors have lower locked rotor current limits compared to general-purpose contactors of the same FLA. To find a suitable replacement, always use the original manufacturer's part number. If that's not possible, base your selection strictly on the motor's FLA and LRA nameplate values.