Get now — Atlantechdrives provides you the 33.18.115, a high-precision miniature power relay by Kuhnke designed for high-density electrical switching in 115V AC control environments. This compact component is essential for engineers looking to optimize cabinet space while maintaining high switching capacity and reliability.
What Is the 33.18.115?
The 33.18.115 is a professional-grade miniature relay from Kuhnke’s 33 series, specifically engineered for 115V alternating current operation. This model is characterized by its high dielectric strength and excellent switching stability in a compact footprint. Built using premium silver-alloy contact materials, the 33.18.115 is resistant to arcing and material transfer, which is a common failure mode in lower-quality relays. Its internal design utilizes a precision spring mechanism that ensures consistent contact pressure, reducing contact bounce and improving the signal-to-noise ratio in sensitive control loops. The 33.18.115 features a thermally stable coil winding and a clear housing that allows for visual inspection of the contact state. Its small size allows for high-density mounting on PCBs or specialized sockets, making it an ideal choice for medical equipment, laboratory automation, and North American industrial control panels where 115V AC is the standard logic voltage. Kuhnke’s engineering ensures that this relay operates with high positional accuracy over millions of cycles, providing a reliable and low-maintenance solution for mission-critical automation.
Key Technical Specifications
- Manufacturer: Kuhnke
- Model: 33.18.115
- Nominal Voltage: 115V AC (50/60 Hz)
- Series: 33 Miniature Power Series
- Contact Capacity: Optimized for standard industrial control loads
- Mechanical Endurance: Tested for millions of operations
- Insulation: High-grade technical polymers for electrical safety
- Mounting: PCB or socket-mount compatible
Applications and Use Cases
The 33.18.115 is frequently utilized in the renewable energy sector, HVAC controls, and industrial material handling systems. In a modern automation architecture, it serves as a high-density interface module, managed by a centralized controller to trigger diverse field devices such as solenoid valves or fans. Its 115V AC coil is perfectly matched for the output profiles of standard industrial PLCs in North American and maritime markets. Because of its miniature size, it is a preferred component for machine builders who design decentralized control boxes that must be mounted directly onto machinery. The 33 series’ reputation for silent and reliable operation makes it a staple in environments where acoustic noise must be minimized, such as in clinical automation or high-end packaging facilities where precision timing is a non-negotiable requirement.
Maintenance Tips
When designing a circuit around the 33.18.115, the thermal layout of the PCB or socket array is critical. While these relays are highly efficient, high-density mounting can lead to localized heat buildup which may increase the coil resistance. We recommend leaving a minimum of 5mm spacing between relays in continuous-duty applications. Furthermore, always verify the peak inrush current of your load; if switching large capacitive or lamp loads, consider the use of an NTC resistor or an RC snubber across the contacts to protect the silver alloy from premature pitting. Periodically check the socket connections for tightness, as thermal cycling in 115V AC systems can cause gradual loosening of the terminal screws.
Frequently Asked Questions
Q: Can the 33.18.115 be used with a 115V DC supply?
A: No, the coil is specifically wound for alternating current (AC). Using a DC supply will cause the coil to draw excessive current and burn out almost instantly due to the lack of inductive reactance.
Q: Is this relay compatible with 230V sockets?
A: While the physical pinout may match some 230V sockets, you must ensure the socket is rated for 115V AC and that no internal LED indicators are voltage-specific before installation.
Do you need more references from this brand? Explore our full catalog of KUHNKE here: https://atlantechdrives.com/manufacturers/kuhnke/
This relay is part of the same Kuhnke 33.18 series as the 33.18.024, offering an alternative contact rating within the same compact relay family for control circuits requiring different switching capacities in identical panel footprints.
