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QIACHIP KR1204B Instruction Manual DC 5V-80V 433MHz RF Remote Control Switch 4-CH Relay Receiver

QIACHIP KR1204B Product Diagram.webp

Version: V1.0

Last Updated: 2025-11-11

Model: KR1204B

Product Size

QIACHIP KR1204B Size Figure.webp

  • Receiver Length (L) × Width (W) × Height (H): 68mm × 48mm × 15mm
  • Housing Length (L) × Width (W) × Height (H): 75mm × 54mm × 25mm
  • Receiver hole horizontal spacing: 62mm; Vertical spacing: 42mm; Hole Diameter: Ø3mm

Component Description

QIACHIP KR1204B Component Description Figure.webp

  • 1: Learning button
  • 2: Indicator light
  • 3: Antenna
  • +V: Positive input terminal
  • -V: Negative input terminal
  • NO1: Normally open terminal of relay1
  • COM1: Common terminal of relay1
  • NC1: Normally closed terminal of relay1
  • NO2: Normally open terminal of relay2
  • COM2: Common terminal of relay2
  • NC2: Normally closed terminal of relay2
  • NO3: Normally open terminal of relay3
  • COM3: Common terminal of relay3
  • NC3: Normally closed terminal of relay3
  • NO4: Normally open terminal of relay4
  • COM4: Common terminal of relay4
  • NC4: Normally closed terminal of relay4

Wiring Diagram

Disconnect power before wiring.

Figure 1

QIACHIP KR1204B Wiring Diagram 1.webp

Figure 1: Wiring diagram for lamps

  • Load: lamps

  • Input Power: DC 5V-80V

Figure 2

QIACHIP KR1204B Wiring Diagram 2.webp

Figure 2: Wiring diagram for AC motors and Lamps

  • Load: AC motors and Lamps
  • Input Power: DC 5V-80V
  • External power supply: AC Power

Figure 3

QIACHIP KR1204B Wiring Diagram 3.webp

Figure 3: Wiring diagram for DC motors

  • Load: DC motors
  • Input Power: DC 5V-80V

Function description and setting method

Normal Modes:

(1) Momentary mode

(2) Toggle mode

(3) Latching mode

(4) Reset function

Combination Modes:

(5) 2CH Momentary mode + 2CH Toggle mode

(6) 2CH Momentary mode + 2CH Latching mode

(7) 2CH Toggle mode + 2CH Latching mode

(8) 2CH Latching mode + 2CH Latching mode

NOTE

  • When using the KR1204 model receiver, at least one remote control with four buttons is required.
  • When pairing a second remote, you don't need to press the button on the receiver 8 times again to reset it.
  • Once the receiver and transmitter are paired and a working mode is selected, the receiver will retain this mode even if powered off and on again.
  • The following working modes require the use of QIACHIP brand remote controls (transmitters) and controllers (receivers/wireless remote control switches). Compatibility with other brands is not guaranteed.

(1) Momentary mode

In this mode:

  • Press and hold the remote control button (such as A), and the corresponding relay on the receiver will turn on.
  • Release the remote control button (such as A), and the corresponding relay on the receiver will turn off.

How to set momentary mode

Step 1

Click the learning button on the receiver once. The indicator light on the receiver will turn on, and the receiver will enter the setting state.

Step 2

Press the button on the remote control (such as A) once. The indicator light on the receiver will flash and then will turn off. The momentary mode will be set successfully.

(2) Toggle mode

In this mode:

  • Press the remote control button (such as A), and the corresponding relay on the receiver will turn on.
  • Press the remote control button (such as A) again, and the corresponding relay on the receiver will turn off.

How to set toggle mode

Step 1

Click the learning button on the receiver twice. The indicator light on the receiver will turn on, and the receiver will enter the setting state.

Step 2

Press the button on the remote control (such as A) once. The indicator light on the receiver will flash and then will turn off. The toggle mode will be set successfully.

(3) Latching mode

In this mode:

  • Press the remote control button (such as A), and the corresponding relay A on the receiver will turn on.
  • Press the remote control button (such as B), and the corresponding relay B on the receiver will turn on while relay A on the receiver will turn off.

How to set latching mode

Step 1

Click the learning button of the receiver three times. The indicator light on the receiver will turn on, and the receiver will enter the setting state.

Step 2

Press the button on the remote control (such as A) once. The indicator light on the receiver will flash and then turn off. The latching mode is set successfully.

(4) Reset function

  • When the KR1204B receiver is reset, all paired transmitters will be unpaired and will no longer be able to control the receiver.

How to reset

Click the learning button on the receiver 8 times. The reset is complete when the indicator light flashes and then turns off.

(5) 2CH Momentary mode + 2CH Toggle mode

In this mode:

The Momentary mode channels (Channel 1, Channel 2) and Toggle mode channels (Channel 3, Channel 4) operate independently. Activating or deactivating a relay in one mode has no impact on the state of relays in the other mode.

For the two channels set to Momentary mode (Channel 1 and Channel 2):

  • Press and hold the remote control button corresponding to relay channel 1 (such as A), and relay channel 1 on the receiver will turn on; release button A, and relay channel 1 will turn off.
  • Press and hold the remote control button corresponding to relay channel 2 (such as B), and relay channel 2 on the receiver will turn on; release button B, and relay channel 2 will turn off.

For the two channels set to Toggle mode (Channel 3 and Channel 4):

  • Press the remote control button corresponding to relay channel 3 (such as C), and relay channel 3 on the receiver will turn on; Press the remote control button C again, and relay channel 3 will turn off.
  • Press the remote control button corresponding to relay channel 4 (such as D), and relay channel 4 on the receiver will turn on; Press the remote control button D again, and relay channel 4 will turn off.

How to set 2CH momentary mode + 2CH toggle mode

Step 1

Click the learning button of the receiver four times. The indicator light on the receiver will turn on, and the receiver will enter the setting state.

Step 2

Press the button on the remote control (such as A) once. The indicator light on the receiver will flash and then turn off. The 2CH momentary mode + 2CH toggle mode is set successfully.

(6) 2CH Momentary mode + 2CH Latching mode

In this mode:

The Momentary mode channels (Channel 1, Channel 2) and Latching mode channels (Channel 3, Channel 4) operate independently. Activating or deactivating a relay in one mode has no impact on the state of relays in the other mode.

For the two channels set to Momentary mode (Channel 1 and Channel 2):

  • Press and hold the remote control button corresponding to relay channel 1 (such as A), and relay channel 1 on the receiver will turn on; release button A, and relay channel 1 will turn off.
  • Press and hold the remote control button corresponding to relay channel 2 (such as B), and relay channel 2 on the receiver will turn on; release button B, and relay channel 2 will turn off.

For the two channels set to Latching mode (Channel 3 and Channel 4):

  • Press the remote control button corresponding to relay channel 3 (such as C), and relay channel 3 on the receiver will turn on;
  • Press the remote control button corresponding to relay channel 4 (such as D), and relay channel 4 on the receiver will turn on, while relay channel 3 turns off simultaneously.

How to set 2CH momentary mode + 2CH latching mode

Step 1

Click the learning button of the receiver five times. The indicator light on the receiver will turn on, and the receiver will enter the setting state.

Step 2

Press the button on the remote control (such as A) once. The indicator light on the receiver will flash and then turn off. The 2CH momentary mode + 2CH latching mode is set successfully.

(7) 2CH Toggle mode + 2CH Latching mode

In this mode:

The Toggle mode channels (Channel 1, Channel 2) and Latching mode channels (Channel 3, Channel 4) operate independently. Activating or deactivating a relay in one mode has no impact on the state of relays in the other mode.

For the two channels set to Toggle mode (Channel 1 and Channel 2):

  • Press the remote control button corresponding to relay channel 1 (such as A), and relay channel 1 on the receiver will turn on; Press the remote control button A again, and relay channel 1 will turn off.
  • Press the remote control button corresponding to relay channel 2 (such as B), and relay channel 2 on the receiver will turn on; Press the remote control button B again, and relay channel 2 will turn off.

For the two channels set to Latching mode (Channel 3 and Channel 4):

  • Press the remote control button corresponding to relay channel 3 (such as C), and relay channel 3 on the receiver will turn on;
  • Press the remote control button corresponding to relay channel 4 (such as D), and relay channel 4 on the receiver will turn on, while relay channel 3 turns off simultaneously.

How to set 2CH toggle mode + 2CH latching mode

Step 1

Click the learning button of the receiver six times. The indicator light on the receiver will turn on, and the receiver will enter the setting state.

Step 2

Press the button on the remote control (such as A) once. The indicator light on the receiver will flash and then turn off. The 2CH toggle mode + 2CH latching mode is set successfully.

(8) 2CH Latching mode + 2CH Latching mode

In this mode:

The Latching mode channels (Channel 1, Channel 2) and Latching mode channels (Channel 3, Channel 4) operate independently. Activating or deactivating a relay in one mode has no impact on the state of relays in the other mode.

For the two channels set to Latching mode (Channel 1 and Channel 2):

  • Press the remote control button corresponding to relay channel 1 (such as A), and relay channel 1 on the receiver will turn on;
  • Press the remote control button corresponding to relay channel 2 (such as B), and relay channel 2 on the receiver will turn on, while relay channel 1 turns off simultaneously.

For the two channels set to Latching mode (Channel 3 and Channel 4):

  • Press the remote control button corresponding to relay channel 3 (such as C), and relay channel 3 on the receiver will turn on;
  • Press the remote control button corresponding to relay channel 4 (such as D), and relay channel 4 on the receiver will turn on, while relay channel 3 turns off simultaneously.

How to set 2CH latching mode + 2CH latching mode

Step 1

Click the learning button of the receiver seven times. The indicator light on the receiver will turn on, and the receiver will enter the setting state.

Step 2

Press the button on the remote control (such as A) once. The indicator light on the receiver will flash and then turn off. The 2CH toggle mode + 2CH latching mode is set successfully.

Electrical characteristics

Parameter Value
Input voltage DC 5V-80V
RF frequency 433.92MHz
Standby current 5 mA
Rated Load Max 120W per channel (4 channels total)
Receiver sensitivity -104dBm
Normal Modes Momentary mode; Toggle mode; Latching mode; Reset function;
Combination Modes 2CH Momentary mode + 2CH Toggle mode; 2CH Momentary mode + 2CH Latching mode; 2CH Toggle mode + 2CH Latching mode; 2CH Latching mode + 2CH Latching mode;
Working temperature -10℃~80℃
Size 68x48x15mm

Warning

  • The positive and negative terminal wires must not be reversed.
  • When using wireless electronic devices, avoid proximity to metal objects, large electronic equipment, electromagnetic fields, and other sources of strong interference.