Voltage Monitoring with HRN Relays: Protection Beyond the Basics Today’s homes and workplaces are full of sophisticated electronics—smart appliances, microcontroller-based systems, and sensitive equipment. Yet many of these devices remain vulnerable to basic electrical disturbances. A sudden overvoltage, undervoltage, or even an incorrectly sequenced three-phase connection can lead to malfunction, damage, or complete failure. To […]
Monitoring Overcurrent and Undercurrent with PRI-32 and PRI-52 Relays ELKO EP’s PRI-32 and PRI-52 current monitoring relays offer a compact and efficient way to monitor AC current—without the need for external shunt connections. Instead, they feature a built-in current transformer with a through-hole design: simply route the consumer’s power line directly through the device. No surprises—just […]
Control of three independent switches In large buildings, offices, and even family homes, hot water is often needed in multiple rooms. When the hot water source is far from the taps, cold water must first be allowed to run before the hot water arrives—leading to unnecessary water waste. Although water is still widely available in […]
Bi-Directional Motor Control Using Relays The MR-42 pulse relay from ELKO EP has proven its versatility in many applications beyond lighting control. In this article, we explore how to use it for bi-directional motor control, such as for blinds, gates, or garage doors. Of course, we’re not just flipping switches—we’re aiming for smart, reliable functionality using […]
A Little Smart Home with a Memory Relay Impulse relays are a great alternative for controlling lighting from multiple locations, but they haven’t fully replaced traditional crossover switch systems. One reason is the added complexity—more devices, more wiring, and higher installation costs. And with the rise of “smart home” systems, their role has diminished further, […]
Using Relays for Smart Light Signaling Garage doors left open overnight can pose a risk—whether to vehicles, property, or personal safety. One way to prevent this is by enabling the delayed automatic closing function available in most motorized garage door systems. Although users sometimes leave it disabled for practical reasons, such as easier access during […]
Timed Disconnection of High-Current Devices Controlling the operation of machines with precise timing is simple with the use of time relays—especially multifunction variants. These devices often integrate the most commonly used timing functions, allowing operators to rely on a single relay type for a range of tasks. This reduces errors and increases the likelihood of […]
Circuit with separate START and STOP buttons In previous discussions, we covered safety mechanisms for preventing accidental device activation. Recently, we also explored how the duration of button presses can influence control logic. This article introduces refined circuit options that build on those ideas—some offering simpler, more elegant solutions. Time Relay Circuit with Separate START […]
Electric Motor Control with Overcurrent Protection 1 Button 2 Timers 3 Protections The numbering—1, 2, 3—may be a coincidence, but it happens to perfectly describe the relay-based motor control circuit shown in Figure 1. Though it might appear complex at first glance, the concept is straightforward: 1 pushbutton controls a bidirectional motor (e.g., gate or […]
Relay-Based Protection Against Accidental Switching Accidental activation or shutdown of machines and devices can have serious consequences—ranging from security concerns to equipment damage. Whether it’s in a workshop, industrial setting, or even a home environment, adding simple protections can significantly improve safety. This guide presents practical circuit solutions to help prevent unintended activation or deactivation, […]
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