{"id":349,"date":"2025-08-08T08:41:58","date_gmt":"2025-08-08T08:41:58","guid":{"rendered":"https:\/\/plcautomations.com\/products\/?post_type=product&p=349"},"modified":"2025-08-08T08:43:20","modified_gmt":"2025-08-08T08:43:20","slug":"omron-ly4-d-dc24-general-purpose-relay-diode-surge-suppression-type-plug-in-solder-terminal-standard-bracket-mounting-single-contact-quadruple-pole-double-throw-contacts-69-ma-rated-load-current","status":"publish","type":"product","link":"https:\/\/plcautomations.com\/products\/product\/omron-ly4-d-dc24-general-purpose-relay-diode-surge-suppression-type-plug-in-solder-terminal-standard-bracket-mounting-single-contact-quadruple-pole-double-throw-contacts-69-ma-rated-load-current\/","title":{"rendered":"Omron LY4-D DC24 General Purpose Relay, Diode Surge Suppression Type, Plug-In\/Solder Terminal, Standard Bracket Mounting, Single Contact, Quadruple Pole Double Throw Contacts, 69 mA Rated Load Current, 24 VDC Rated Load Voltage"},"content":{"rendered":"

Here’s a detailed Pros and Cons Q&A<\/strong> for the Omron LY4-D DC24<\/strong> General Purpose Relay:<\/p>\n

\n

\ud83d\udd27 Product Overview:<\/strong><\/h3>\n
    \n
  • Model<\/strong>: Omron LY4-D DC24<\/strong><\/li>\n
  • Type<\/strong>: General Purpose Electromechanical Relay<\/strong><\/li>\n
  • Coil Voltage<\/strong>: 24 VDC<\/strong><\/li>\n
  • Coil Current<\/strong>: Approx. 69 mA<\/strong><\/li>\n
  • Contact Configuration<\/strong>: 4PDT (Quadruple Pole Double Throw)<\/strong>\n
      \n
    • 4 Form C contacts<\/strong><\/li>\n<\/ul>\n<\/li>\n
    • Mounting<\/strong>: Plug-in<\/strong> (with optional socket) or solder terminal<\/strong><\/li>\n
    • Surge Suppression<\/strong>: Built-in Diode<\/strong> for reverse polarity protection and arc suppression<\/li>\n
    • Typical Use<\/strong>: Industrial control panels, automation systems, motor control, lighting circuits<\/li>\n<\/ul>\n
      \n

      \u2705 Pros:<\/strong><\/h3>\n
        \n
      1. Built-in Diode for Surge Suppression<\/strong>\n
          \n
        • Provides protection against voltage spikes<\/strong> when the coil is de-energized, which is essential for DC circuits<\/strong> to prevent damage to sensitive control electronics<\/strong>.<\/li>\n<\/ul>\n<\/li>\n
        • Versatile 4PDT Contact Configuration<\/strong>\n
            \n
          • Offers four double-throw switches in one relay<\/strong>, allowing control of multiple circuits simultaneously<\/strong>\u2014ideal for complex switching logic<\/strong> or redundant systems<\/strong>.<\/li>\n<\/ul>\n<\/li>\n
          • Plug-in or Solder Terminal Options<\/strong>\n
              \n
            • Supports easy replacement via socket<\/strong> or permanent soldering<\/strong> depending on design needs. Makes maintenance or testing faster and more flexible.<\/li>\n<\/ul>\n<\/li>\n
            • Reliable Omron Build Quality<\/strong>\n
                \n
              • Known for long mechanical and electrical life<\/strong>, Omron relays are used globally in mission-critical industrial applications<\/strong>.<\/li>\n<\/ul>\n<\/li>\n
              • Standardized Bracket Mounting<\/strong>\n
                  \n
                • Can be DIN rail or panel mounted<\/strong> (depending on socket\/bracket used), making integration into standard control enclosures<\/strong> straightforward.<\/li>\n<\/ul>\n<\/li>\n
                • Clear Contact Isolation<\/strong>\n
                    \n
                  • 4PDT structure provides high isolation<\/strong> between outputs, improving safety and reducing the chance of electrical interference.<\/li>\n<\/ul>\n<\/li>\n
                  • Wide Range of Compatible Sockets and Accessories<\/strong>\n
                      \n
                    • Easily paired with P2RF<\/strong> series sockets or relay modules to simplify wiring, mounting, and replacement.<\/li>\n<\/ul>\n<\/li>\n<\/ol>\n
                      \n

                      \u274c Cons:<\/strong><\/h3>\n
                        \n
                      1. Mechanical Wear Over Time<\/strong>\n
                          \n
                        • As an electromechanical relay<\/strong>, it is subject to contact wear and coil fatigue<\/strong> over thousands to millions of cycles\u2014less suitable for very high switching frequencies<\/strong>.<\/li>\n<\/ul>\n<\/li>\n
                        • Limited Switching Speed<\/strong>\n
                            \n
                          • Switching speed is slower than solid-state relays (typically 10\u201320 ms<\/strong>), making it unsuitable for high-speed automation tasks<\/strong>.<\/li>\n<\/ul>\n<\/li>\n
                          • Needs External Flyback Consideration in Some Circuits<\/strong>\n
                              \n
                            • Although it has a built-in diode<\/strong>, care must still be taken with how the circuit handles inductive kickback<\/strong>, especially when used with PLC outputs<\/strong>.<\/li>\n<\/ul>\n<\/li>\n
                            • Bulky Size for Compact Applications<\/strong>\n
                                \n
                              • The 4PDT configuration means a larger form factor<\/strong>, which might be overkill or too large for space-constrained enclosures<\/strong>.<\/li>\n<\/ul>\n<\/li>\n
                              • Not Suitable for AC Coil Applications<\/strong>\n
                                  \n
                                • This specific model is DC24 only<\/strong>\u2014won\u2019t function in AC control systems<\/strong> unless a separate AC version is selected.<\/li>\n<\/ul>\n<\/li>\n
                                • No Built-in Indicator or Test Button<\/strong> (Model-dependent)\n
                                    \n
                                  • Some variants lack LED indicators<\/strong> or manual test levers<\/strong>, which can make diagnostics or troubleshooting more difficult without external tools.<\/li>\n<\/ul>\n<\/li>\n<\/ol>\n
                                    \n

                                    \u2753 Q&A \u2013 Practical Use Considerations<\/strong><\/h3>\n

                                    Q1: What does the “-D” mean in LY4-D?<\/strong>
                                    \n\ud83d\udd39 It indicates that the relay includes a built-in diode<\/strong> across the coil for surge suppression<\/strong> (flyback protection). Essential for DC control systems.<\/p>\n

                                    \n

                                    Q2: Can I use this relay to switch 230V AC loads?<\/strong>
                                    \n\ud83d\udd39 Yes<\/strong>, as long as the contacts are rated for the voltage and current<\/strong>. Check datasheet for specific contact ratings (usually around 10A at 250V AC<\/strong>).<\/p>\n

                                    \n

                                    Q3: Can it be used directly with PLC digital outputs?<\/strong>
                                    \n\ud83d\udd39 Yes, but check the PLC output rating<\/strong> (24 VDC, 100 mA typical) to ensure it can drive the 69 mA coil current<\/strong>. Also, verify polarity due to the internal diode.<\/p>\n

                                    \n

                                    Q4: How many operations can this relay perform?<\/strong>
                                    \n\ud83d\udd39 Mechanical life<\/strong> is typically millions of operations<\/strong>; electrical life<\/strong> depends on load type\u2014e.g., resistive loads will give much longer life than inductive.<\/p>\n

                                    \n

                                    Q5: Is socket mounting necessary?<\/strong>
                                    \n\ud83d\udd39 Not mandatory<\/strong>, but highly recommended<\/strong> for ease of maintenance, especially in control panels. Use Omron P2RF sockets<\/strong> for compatibility.<\/p>\n

                                    \n

                                    \ud83e\udde9 Ideal Applications:<\/strong><\/h3>\n
                                      \n
                                    • Motor control circuits<\/li>\n
                                    • Multi-circuit switching<\/li>\n
                                    • HVAC systems<\/li>\n
                                    • Lighting automation<\/li>\n
                                    • Signal routing and interlocking systems<\/li>\n
                                    • Industrial equipment where multiple outputs need to be switched in sync<\/strong><\/li>\n<\/ul>\n
                                      \n

                                      \u2705 Summary:<\/strong><\/h3>\n

                                      The Omron LY4-D DC24<\/strong> is a rugged and versatile general-purpose relay<\/strong> ideal for multi-circuit control in DC-powered systems<\/strong>. With a 4PDT configuration<\/strong>, diode surge suppression<\/strong>, and standard mounting options<\/strong>, it offers excellent control flexibility<\/strong>, safety, and long-term reliability.<\/p>\n

                                      However, it’s not designed for high-speed or compact applications<\/strong>, and its mechanical contacts<\/strong> mean it\u2019s not ideal for extremely frequent switching<\/strong> compared to solid-state relays.<\/p>\n

                                      \n

                                       <\/p>\n","protected":false},"excerpt":{"rendered":"

                                      \n
                                      \n\n\n\n\n\n\n\n
                                      Connector Type<\/span><\/td>\nSolder, Plug-In<\/span><\/td>\n<\/tr>\n
                                      Contact Material<\/span><\/td>\nSilver Alloy<\/span><\/td>\n<\/tr>\n
                                      Contact Type<\/span><\/td>\nNormally Open, Normally Closed<\/span><\/td>\n<\/tr>\n
                                      Current Rating<\/span><\/td>\n10 Amps<\/span><\/td>\n<\/tr>\n
                                      Mounting Type<\/span><\/td>\nPlug In Mount<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n
                                      <\/div>\n
                                      <\/div>\n
                                      \n
                                      \n
                                      \n

                                      About this item<\/h1>\n
                                        \n
                                      • Electric relay for controlling electric signals in low current applications<\/span><\/li>\n
                                      • Plug-in\/solder terminals for plugging into a socket or soldering contacts<\/span><\/li>\n
                                      • 4PDT for change-over switching with four poles<\/span><\/li>\n
                                      • Built-in diode for surge suppression<\/span><\/li>\n
                                      • UL listed for safety, CSA and IEC certified for quality assurance<\/span><\/li>\n<\/ul>\n

                                        Product Description<\/h2>\n
                                        \n

                                         <\/p>\n

                                        This Omron LY4-D DC24 general purpose relay has plug-in terminals, mounts to a standard bracket and is suitable for use in low current applications. This relay has quadruple pole double throw (4PDT) contacts, an input current rating of 69 mA and a load rating of 110VAC at 10 amp, with an input of 24VDC. It has plug-in terminals for connecting to a socket and mounts to a standard bracket on a flat surface. This general purpose relay has a compact design and is suitable for use in installations with limited space.<\/p>\n

                                        Specifications<\/h5>\n

                                        Contact Form4PDTInput Current Rating69 mAInput Voltage24VDCLoad Rating24VDC, 10 ampDielectric Strength2,000VACOperating Temperature-25 to +55 degrees CEnclosure Dimensions*35.6 x 21.6 x 27.9mm (H x W x D)Standards MetUL (Underwriter’s Laboratories)
                                        \nCSA (Canadian Standards Association)
                                        \nIEC (International Electrotechnical Commission)
                                        \n*H is height, the vertical distance from the lowest to highest point; W is width, the horizontal distance from left to right; D is depth, the horizontal distance from front to back.<\/p>\n

                                        Relay switches (also called an electrical relay or an electrical relay switch) use a small amount of power to control a larger source of power connected to electrical devices such as car motors, computers, and lighting installations. A basic relay switch has a control circuit with an electromagnetic coil and a load circuit with contacts and a lever. When current flows into the relay switch, it moves through the coil and a magnetic field is created, which causes the lever in the load circuit to move between contacts, either turning the device on or off. In a normally open (NO) relay switch, when power is supplied to the relay, the load circuit is closed and the power source connected to the relay is turned on. In a normally closed (NC) relay switch, when power is supplied to the relay, the load circuit is open and the power source connected to the relay is turned off. In other types of relay switches, non-moving parts such as transistors or semiconductors can be used as the control circuit to operate the switching mechanism. Relay switches can be controlled with an external switch, such as a light switch, or they can be connected to an automatically switched power source, such as a car ignition. One relay can operate multiple switches, and multiple relays can be operated with a single switch, with each relay operating independently from the other relays in the system.<\/p>\n<\/div>\n<\/div>\n<\/div>\n","protected":false},"featured_media":350,"comment_status":"open","ping_status":"closed","template":"","meta":{"_seopress_robots_primary_cat":"","_seopress_titles_title":"","_seopress_titles_desc":"","_seopress_robots_index":""},"product_brand":[33],"product_cat":[27],"product_tag":[],"class_list":{"0":"post-349","1":"product","2":"type-product","3":"status-publish","4":"has-post-thumbnail","6":"product_brand-omron","7":"product_cat-omron","9":"first","10":"instock","11":"shipping-taxable","12":"product-type-external"},"yoast_head":"\nOmron LY4-D DC24 General Purpose Relay, Diode Surge Suppression Type, Plug-In\/Solder Terminal, Standard Bracket Mounting, Single Contact, Quadruple Pole Double Throw Contacts, 69 mA Rated Load Current, 24 VDC Rated Load Voltage - Products<\/title>\n<meta name=\"description\" content=\"Omron LY4-D DC24 General Purpose Relay, Diode Surge Suppression Type, Plug-In\/Solder Terminal, Standard Bracket Mounting, Single Contact, Quadruple Pole Double Throw Contacts, 69 mA Rated Load Current, 24 VDC Rated Load Voltage\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/plcautomations.com\/products\/product\/omron-ly4-d-dc24-general-purpose-relay-diode-surge-suppression-type-plug-in-solder-terminal-standard-bracket-mounting-single-contact-quadruple-pole-double-throw-contacts-69-ma-rated-load-current\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Omron LY4-D DC24 General Purpose Relay, Diode Surge Suppression Type, Plug-In\/Solder Terminal, Standard Bracket Mounting, Single Contact, Quadruple Pole Double Throw 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