Shanghai 3S Global Company Limited

4kW Dual Pump Control Box - Motor Protector for Booster & Drainage

RS485 Pump Controller,Duplex Pump Protection,Modbus Pump Control,Water Supply Pump Control Panel

Product Category

4kW Dual Pump Control Box - Motor Protector for Booster & Drainage

4kW Dual Pump Control Box - Motor Protector for Booster & Drainage

Product Category : Intelligent Pump Controller - RS485 Pump Box

Model: 3S-A12-040-485

Chip: ST

Relay: HongFa

MCB/AC Contactor: CHINT

Working Pump: 0.37-4kW, 2 Pumps

Startup Method: DOL (Direct On Line)

Rated Voltage&Frequency: Single-phase AC110-250V, 50/60Hz

Remote Control: RS485/RS232(Modbus RTU)

Protection Degree: IP55, PCB waterproof/dustproof

Protections: 13 types protection

Signal Compatibility: Digital, 4–20mA analog, and 0–5V analog

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Product Description

Advanced Application & Integration

RS485 Modbus pump controller engineered for small booster stations and monitoring systems that require robust control and connectivity. The ABS dual pump intelligent control starter seamlessly integrates into industrial networks and smart systems via its communication interface.

Key Features

RS485 Interface for Smart Integration Equipped with Modbus communication capability, the optional RS485 module enables connection with PLC, HMI, and system platforms, facilitating the construction of remotely controllable intelligent pump control systems.

Comprehensive 13 Safety Protection Mechanisms

Motor protection type of RS485 Modbus pump controller: Pump stalled, overload, underload, locked rotor, blockage, short circuit

Definition	Default Value	Parameter Setting Range
Startup Delay	3s	0-60s Unit is second (s)
During the pump startup, all current protection functions are temporarily inactive within the set delay time.
Overload protection (Inverse-time logic)	ON	ON/OFF
This protection is triggered when the pump running current exceeds the set inverse-time thermal overcurrent value for longer than the preset trip delay.
Overload ratio (Inverse-time logic)	120%	100～130%
Percentage setting of pump inverse-time thermal overload current relative to rated current.
Inverse-time overload curve level	Protection trip level: 5	1～30
Dynamically adjusts protection response time based on current: high current trips fast, low current trips slower.
Overload auto recovery time (Inverse-time logic)	30m	0～120m Unit is minutes (m)
After overload protection is triggered, the controller automatically recovers after the set overload recovery time.
Overload protection (Definite-time logic)	OFF	ON/OFF
This protection is triggered when the pump running current exceeds the set definite-time thermal overload value for longer than the preset trip delay.
Overload ratio (Definite-time logic)	130%	100～600%
Percentage setting of pump definite-time thermal overload current relative to rated current.
Definite-time overload trip response time	20s	1～120s Unit is second (s)
Overload protection is triggered when the overload condition persists beyond the set time.
Definite-time overload auto recovery time	30m	0～120m Unit is minutes (m)
After overload protection is triggered, the controller automatically recovers after the set overload recovery time.
Underload protection	ON	ON/OFF
This protection is triggered when the pump running current falls below the set underload value for longer than the preset trip delay.
Underload ratio	65%	1～99%
Percentage setting of pump underload current relative to rated current.
Underload protection trip response time	5s	1～120s Unit is second (s)
Underload protection is triggered when the underload condition persists beyond the set time.
Underload auto auto recovery time	30m	0～120m Unit is minutes (m)
After underload protection is triggered, the controller automatically recovers after the set underload recovery time.
Locked rotor protection	ON	ON/OFF
This protection is triggered when the pump running current exceeds the set locked-rotor value for longer than the preset trip delay.
Locked rotor ratio	400%	100～600%
Percentage setting of locked-rotor current relative to rated current.
Locked rotor protection trip response time	3s	1～120s Unit is second (s)
Locked-rotor protection is triggered when the locked-rotor condition persists beyond the set time.
Blockage protection	ON	ON/OFF
This protection is triggered when the pump running current exceeds the set blockage value for longer than the preset trip delay.
Blockage ratio	240%	100～600%
Percentage setting of blockage current relative to rated current.
Blockage protection trip response time	5s	1～120s Unit is second (s)
Blockage protection is triggered when the blockage condition persists beyond the set time.
Short circuit	1 second	Non-adjustable
Quickly disconnects power to prevent motor damage.

Industrial-Grade Enclosure and User-Friendly Operation Design

The RS485 Modbus pump controller features a high-strength ABS material protective housing with IP65 rating, making the ABS dual pump intelligent control starter suitable for outdoor or humid environments. It is equipped with an LCD screen, physical buttons, adjustable backlight, and built-in audible and visual alarms for convenient operation in various conditions.

Duplex Pump Probe Water Supply (For wiring details, please contact 3S)

Three-Probe Water Supply:

Functions: Automatic pump start/stop, signal loss alarm, low level dual-pump simultaneous start, medium level single-pump operation, high level pump stop.

Five-Probe Water Supply:

Functions: Automatic pump start/stop, signal loss alarm, dry-run protection, low level dual-pump simultaneous start, medium level single-pump operation, high level pump stop.

The RS485 Modbus pump controller supports these configurations.

Typical Applications

Application Type	Common Challenges	3S Controller Solutions
Factory Small Booster Station	Unstable water pressure during peak hours; inability to switch to backup pump promptly.	The RS485 Modbus pump controller uses seamless dual-pump rotation to maintain stable pressure and improve efficiency.
Community Drainage Monitoring Station	Uneven pump run time distribution causing single pump wear; difficulty detecting signal loss.	The ABS dual pump intelligent control starter built-in signal loss alarm ensures quick fault detection; automatic load balancing logic prevents single pump overload, extending equipment life.
Smart Building Water Supply/Drainage	Difficult system expansion and integration with other devices.	Optional RS485 interface allows easy connection to PLC, central control, or BMS, enhancing system integration.
Small Water Treatment Station	Complex conditions requiring frequent operational logic changes.	Modbus pump control built-in multiple operation modes support quick local switching to adapt to different on-site needs.