Relay boards RB-8R-48V data sheet

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Designed for applications from 12 to 48 Volt DC, the RB-8R-48V is a relay board equipped with eight relays each one capable of switching up to 10 Amp current. The relay board inputs are optically isolated therefore there is complete separation between inputs, outputs and the circuitry driving the relays. The power voltage can be anywhere between 15 and 48 volt DC and does not require to be regulated, making this board ideal for battery operation.

Benefits

• Wide input voltage range

• Separate input loops

• Switching of up to 80 Amp current all relays combined

• Mix and match of floating and common reference inputs

• Compact size

• Battery inversion protected

• Auxiliary +12V and +5V regulated outputs.
  

Typical applications

• Automotive

• Lamp, alarm, sound drive

• Emergency switch

• Battery power main switch

• Motor direction control

• Electric brake

Main parameters

• Vbb from 12 to 48 volt
• Input Voltage = - 48 to + 48 Volt
• Relay Output Current: 10 Amp at 120VAC - 8 Amp at 30VDC
• +12Volt/200 milliamp power supply
• +5Volt/200 milliamp power supply for TTL inputs

Application Information

The RB-8R-48V board accepts a power voltage from 12 to 48 volt; it has opto-insulated inputs so it can be used:

• With all inputs loops separate and independent from each other.With all inputs sharing connection – 1 as an independent common reference.
• With all inputs sharing a common ground reference.
• With any mix of separate loops and common reference loops.
• Some or all input returns can be joined together by setting jumpers, which will short selected return inputs to the return of input 1, sharing return –1 as a common reference.

Additional inputs connector

Four additional inputs numbered 9 to 12 are provided. They can be wired on the board to inputs 1, 2 and 3 in any combination to provide additional inputs. The additional inputs are OR’ed, that is they energize the corresponding relay if either input is High.

Logic levels

The input voltage is considered logic High if higher than 3.5 Volt and logic Low if lower than 1.0 Volt. Negative input voltages are acceptable up to –48 Volt and considered logic Low. Positive input voltages between 1.0 and 3.5 Volt need to be avoided, since they cannot be interpreted neither High or Low. In order to enhance noise immunity, each input loop has a resistance of 12 k Ohm, so the input drive needs to be able to supply the relevant input current ( 0.5 to 5 milliAmp according to the value of the input voltage ) .

A High input will energize the relevant relay; a green LED will visually indicate it.. Each relay is has a SPDT ( Single Pole Double Throw ) configuration and it is connected to a three terminals screw-in connector, which poles are indicated NC ( Normally closed ) , CT ( Center Tap ) and NO ( Normally Open ) . Due to the double insulation ( opto and magnetic ) the power output loops are separate from the controlling input loops and the relay control circuitry.

relay board connections

Power connector

The Vbb input ( marked +48V on the board ) is protected by a diode against wrong battery connection ( inverted battery connection ) .
Two auxiliary power outputs are provided, +5Volt/200 milliAmp ( marked +5V OUT on the board ) and +12Volt/200 milliAmp ( marked +12V on the board ) for use such as providing a 5/12 Volt supply to logic ( loss of opto-isolation possible ) .

RB-8R-48V relay board connection diagram

Mechanical

Dimensions: 5 x 4.3 inches / 127 x110 millimeters
Weight: 0.5 lbs / 220 grams

Ordering instructions

Part number: RB-8R-48V .

Shipping: boards are shipped with all eight jumpers installed so with all return paths are connected together as common return path –1. Remove jumpers as needed to implement other input configurations.