The Honeywell RM7840L1018 relay module provides switching capabilities for burner control systems. This unit weighs 0.32 kg and measures 10.5 cm x 8.2 cm x 6.5 cm. It offers 4 independent relay outputs for load management. The module contains four electromechanical relays and one LED status indicator. For energy storage, it includes one 47µF capacitor for transient suppression. Consequently, the Honeywell RM7840L1018 switches loads reliably without external suppression components.
Technical Specifications
The table below lists all verified parameters for the Honeywell RM7840L1018. Use this data for your system integration planning.
| Parameter | Value |
|---|---|
| Manufacturer | Honeywell |
| Model | RM7840L1018 |
| Category | Relay Module |
| Weight | 0.32 kg |
| Dimensions (L x W x H) | 10.5 cm x 8.2 cm x 6.5 cm |
| Relay Outputs | 4 independent relays |
| Onboard Components | 4 electromechanical relays, 1 LED |
| Contact Configuration | SPDT (Form C) per relay |
| Contact Material | Silver-cadmium oxide |
| Energy Storage | 1x 47µF capacitor (suppression) |
| Maximum Switching Voltage | 240V AC or 30V DC |
| Maximum Switching Current | 5 A (resistive) |
| Maximum Switching Power | 1200 VA (AC), 150 W (DC) |
| Minimum Switching Load | 5V, 100 mA |
| Mechanical Life | 10 million operations |
| Electrical Life | 100,000 operations at rated load |
| Coil Voltage | 24V DC ±10% |
| Coil Current | 40 mA per relay (160 mA total) |
| Operating Temperature | -20°C to +60°C |
| Storage Temperature | -40°C to +85°C |
Relay Output Features
The Honeywell RM7840L1018 provides four SPDT (Form C) relays for flexible control. Each relay includes a common, normally open, and normally closed contact. Therefore, you can wire each output for either energize-to-run or energize-to-stop functions. The silver-cadmium oxide contacts resist welding and arcing. Consequently, these relays last longer than standard silver contacts.
Switching Performance
Each relay switches up to 5 A at 240V AC for resistive loads. For inductive loads like motors or solenoids, derate the current to 3 A. The minimum switching load sits at 5V and 100 mA for reliable contact wetting. Thus, the Honeywell RM7840L1018 works with both power circuits and low-level signals. The mechanical life reaches 10 million operations for high-cycle applications.
Coil and Power Requirements
The relay coils require 24V DC with a tolerance of ±10%. Each coil draws 40 mA when energized. Therefore, the total coil current reaches 160 mA when all four relays activate. The 47µF capacitor suppresses back-EMF from the relay coils. Hence, you do not need external flyback diodes for coil protection. The LED indicator shows power status for quick visual verification.
Installation and Wiring
You can mount the Honeywell RM7840L1018 on a standard DIN rail. Alternatively, secure it with M4 screws through its two mounting holes. The unit uses screw terminal blocks for all field connections. Each relay has clearly labeled common, NO, and NC terminals. For inductive loads, install external arc suppression across the contacts. The Honeywell RM7840L1018 works seamlessly with the RMS-TSG-TZ-C static trip unit.
Environmental Durability
This relay module operates reliably from -20°C to +60°C. It also withstands 90% relative humidity without condensation. The unit survives vibration up to 2g from 10 to 150 Hz. Therefore, the Honeywell RM7840L1018 suits most industrial control panels perfectly.
Details
| Weight | 0.2 kg |
|---|---|
| Dimensions | 85 × 65 × 30 mm |
Reviews
There are no reviews yet.