Блок предохранителей FAW в сборе: The 11 Раскрыты основные исправные агрегаты

Добро пожаловать в эту глубокую деконструкцию Блок предохранителей FAW в сборе (Часть №. 3722010-92Вт). This component is the primary electrical nerve center for the driver’s cab in the FAW Jiefang CA4251P66K24T1A3E5 6×4 дизельный полуприцеп тягач. It is not merely a fuse holder; it is an integrated “логика” hub that manages, protects, and switches nearly every single electrical function within the cab, from the instrument cluster to the power windows.

The design “логика” принадлежащий Блок предохранителей FAW в сборе is to centralize power distribution, circuit switching, and circuit protection into a single, serviceable module. This assembly takes high-amperage feeds from the battery and main power lines and intelligently distributes that power to dozens of individual circuits, each protected by a specific-amperage fuse. It also houses the critical relays that allow low-power dashboard switches to safely control high-power devices.

This technical analysis is an essential resource for professional technicians and parts specialists. Мы разберем всю Блок предохранителей FAW в сборе, breaking down the main housing and identifying every Minimum Serviceable Unit (МГУ) it contains. We will analyze the three types of plug-in relays (4-приколоть, 5-приколоть, and main), the five different ratings of fuses, and the specific service tools designed for its maintenance.

Основной 1: The Structural Core (3722010-92Вт) & Аппаратное обеспечение

The ‘Cab fuse & relay box assy’ (3722010-92Вт) is the primary structural component, а “large purchase item” that forms the foundation of the Блок предохранителей FAW в сборе. Its design is more complex than it appears.

Внутренняя логика: The “логика” of this housing is its sophisticated internal busbar system. Molded within the high-grade, heat-resistant polymer is a network of copper pathways. These busbars take the main power feeds (from the battery and ignition switch) and distribute them to the “горячий” side of all 56 fuse sockets and 12 relay sockets. This design eliminates dozens of potential failure points, increases reliability, and simplifies the main cab harness.

Sealing and Mounting: This box is located inside the cab, but it is still designed to be a sealed unit, typically with a gasketed cover (продается отдельно) to protect the sensitive connections from dust and moisture. The ‘Cross recessed pan head combination screw’ (Q2360640) is the hardware specified for mounting the assembly securely to the cab’s bulkhead, ensuring it is grounded and resistant to vibration.

Основной 2: The “Логика” in Action – A Deep Dive into the Relays (МГУ)

Это “дольше” and most complex section of the Блок предохранителей FAW в сборе. The relays are the electro-mechanical switches that perform the “логика” системы. They are all plug-in MSUs. This assembly uses three distinct types, each with a specific function.

1. The Workhorse: ‘Four-pin relay assy (20А)’ (3711030-240)

The parts list calls for **eight (8)** из этих. A 4-pin relay is a simple “вкл/выкл” выключатель. Its logic is to use a low-power circuit (from a dashboard switch) to control a high-power (20А) схема. The low-power switch energizes a coil (Булавки 85/86), which creates a magnetic field that “тянет” an internal switch, connecting the high-power-in (Приколоть 30) to the high-power-out (Приколоть 87).

The presence of eight of these in the Блок предохранителей FAW в сборе indicates it is the central control for all major cab accessories: HVAC fan, wiper motor, power sockets, window lifters, auxiliary lighting, и т. д.. Failure is common (stuck “на” или “выключенный”) and they are designed to be swapped for easy diagnosis.

2. The Smart Switch: ‘Five-pin relay assy (20А)’ (3741070-240)

This box contains **two (2)** из этих. A 5-pin relay is a “changeover” выключатель. It has two “out” positions: один “Normally Closed” (Pin 87a) и один “Normally Open” (Приколоть 87). When the relay is “выключенный,” power flows from Pin 30 to Pin 87a. When the relay is energized, это “changes over,” breaking the 87a connection and making the 87 связь.

Этот “логика” is essential for functions that need to *switch between* two states. The most common example is the headlight circuit (switching from low beams [87а] to high beams [87]) or for systems that need to default to “на” and be turned “выключенный” by a signal.

3. The Gatekeeper: ‘Main relay assy’ (3722110-671)

The assembly includes **two (2)** ‘Main relays’. These are the most critical switches in the entire Блок предохранителей FAW в сборе. A main relay’s “логика” is to control power to *entire banks of fuses* at once. It is the gatekeeper.

One relay is typically triggered by the “Аксессуар” key position, sending power to comfort items like the radio. The second is triggered by the “Зажигание” key position, powering all mission-critical systems (like the instrument cluster and ECU power). A failure of one of these two relays will cause a massive, system-wide outage (НАПРИМЕР., “half the cab is dead”), but is still a simple, plug-in MSU.

Основной 3: The Protection Grid – Предохранители & Service Tool (МГУ)

The most numerous MSUs in the Блок предохранителей FAW в сборе are the blade-type fuses. Их “логика” is to be the sacrificial weak link, failing instantly in an overcurrent event to protect expensive harnesses and components from melting or fire.

The population of 56 fuses shows the complexity of this cab:

• 5A Blade-type fuse (3722011-50): 9 единицы. For very low-power circuits, such as ECU memory, interior LEDs, и “контроль” сторона 12 реле.
• 10A Blade-type fuse (3722012-50): 32 единицы. This is the vast majority, protecting all standard cab circuits: individual lights, instrument cluster, telematics, радио, датчики, и т. д..
• 15A Blade-type fuse (3722013-50): 6 единицы. For medium-load “комфорт” схемы, like cigarette lighters, 24V power sockets, and audio amplifiers.
• 20A Blade-type fuse (3722014-50): 7 единицы. These are paired with the 20A relays to protect high-load circuits like the HVAC fan, wiper motor, and power windows.
• 30A Blade-type fuse (3722017-50): 2 единицы. These protect the highest-load circuits in the cab, such as a main feed for an inverter or the main power for the entire window/door control module.

Окончательно, the ‘Puller clip’ (171937579) is a simple but critical MSU. Его “логика” is serviceability, providing the technician (or driver) the correct tool to safely remove and replace fuses without damaging the fuse or the box. Its inclusion in the assembly is a key design feature.

FAW Fuse Box Logic Assembly Parts List

The following table is the complete, 11-component-type breakdown for the Блок предохранителей FAW в сборе (3722010-92Вт) for the FAW CA4251P66K24T1A3E5 tractor.

Технические характеристики и контекст сборки

Технические характеристики Блок предохранителей FAW в сборе are defined by its role as the central, high-density power distribution and switching unit for all cab-based electrical systems.