Westinghouse DS/DSL series low-voltage power circuit breakers

Westinghouse DS/DSL series low-voltage power circuit breakers

Detailed explanation of core product information

1. In depth analysis of technical parameters

Category parameter details note explanation

Voltage and current voltage range 208-600Vac, continuous current 50-4000A DSL series supports up to 600Vac, sensors can be replaced to adapt to different current levels

Breaking capacity DS series 30000-65000A; DSL series 200000A DSL relies on built-in current limiting components to enhance breaking capacity, suitable for high short-circuit current scenarios

Amptector II-A (standard type) and Amptector I-A (with grounding protection) solid-state trip units with adjustable parameters, high repeatability, and no mechanical wear

Operation modes: manual (spring energy storage), electric (motor energy storage+remote control). The electric type supports emergency manual energy storage to deal with control power failures

Installation forms include drawer style (mainstream) and fixed drawer style, which support four working positions for extraction, disconnection, testing, and connection, making maintenance convenient

Environmental adaptability operating temperature -20~+40 ℃, humidity ≤ 95% (no condensation). Keep away from dust and corrosive gases to avoid insulation aging

2. Product classification and core differences

(1) DS series (basic type)

Core features: No built-in current limiting components, simple structure, high cost-effectiveness, breaking capacity of 30000-65000A.

Mainstream models:

DS-206/206S: Frame current 800A, DS-206S is an upgraded version (with a breaking capacity of 42000A, better than DS-206's 30000A).

DS-416/416S/420: Frame current 1600A (416/416S), 2000A (420), 416S breaking capacity 65000A.

DS-632/840: Frame current 3200A (632), 4000A (840), suitable for large capacity distribution systems.

Applicable scenarios: Conventional industrial power distribution, commercial buildings, and situations with small fault currents (≤ 65000A).

(2) DSL series (current limiting enhanced type)

Core features: Equipped with a built-in current limiter, the breaking capacity has been increased to 200000A, which can quickly cut off large short-circuit currents and protect downstream equipment.

Mainstream models: DSL-206 (800A), DSL-416 (1600A), DSL-632/840 need to be used with an independent fuse car.

Applicable scenarios: Industrial scenarios with high short-circuit currents such as chemical and metallurgical industries, or critical distribution circuits that require enhanced protection.

(3) Fuse Trucks

Core features: Independent drawer design, equipped with Class L current limiting fuse, used in series with DS-632/840 circuit breaker.

Mainstream models: DS-3200 (3200A), DS-4000 (4000A), with fuse indicator.

Applicable scenario: Distribution systems that require graded protection, which achieve selective tripping through the combination of fuses and circuit breakers.

3. Function analysis of the trip unit

(1) Amptector II-A (Standard Type)

Adjustable parameters:

Long delay: Current 0.5-1.25 times the rated value of the sensor, time 8-36 seconds (at 6 times the rated current).

Short delay: current 4-10 x sensor rated value, time 0.18-0.5 seconds.

Instantaneous: current 4-12 times the rated value of the sensor, without delayed tripping.

Core function: Covering basic protection against overload and short circuit, supporting three combination modes: DU (long delay+instantaneous), SE (long delay+short delay), and TR (triple protection).

(2) Amptector I-A (optional)

Additional features: Added ground fault protection (adjustable current, delay of 0.22-0.5 seconds), trip indicator (overload/short circuit/ground fault indication separately).

Applicable scenarios: Ground fault sensitive scenarios (such as humid environments and places with high personal safety requirements).

Safety operation standards (including risk avoidance)

1. Personnel and Qualification Requirements

Operation qualification: Only personnel with low voltage distribution operation qualification are allowed to install and maintain, and they need to be familiar with equipment structure, interlocking mechanism, and electric shock risk.

Protective equipment: Insulated gloves and goggles must be worn during operation, insulated shoes must be worn, and slippers, bare feet, or loose clothing are prohibited (to avoid getting caught up in mechanical parts).

Prohibited behavior: Unauthorized personnel are prohibited from operating; It is prohibited to dismantle the arc extinguishing chamber and insulation barrier during equipment operation; Prohibit blocking or modifying interlocking devices (which may cause equipment misoperation and lead to accidents).

2. Installation and wiring safety

Pre installation inspection:

Check the nameplate parameters (voltage, current, breaking capacity) to match the system, and confirm that the circuit breaker is not damaged during transportation (contacts, arc extinguishing chamber, interlocking components are intact).

The drawer type circuit breaker needs to check that the guide rail and rocker are not deformed, and that the energy storage spring is not fatigued or corroded.

Wiring specifications: