This listing offers a bulk lot of replacement reed relay switches in a compact SIP package. The set provides two coil voltage variants (5V and 12V) and a 4pin configuration, suitable for a range of replacement and prototyping needs. Key features and benefits 50 pieces per lot: a cost effective supply of replacement relays for ongoing projects and service parts. Coil voltage options: SIP1A05 5V coil variants and SIP1A12 12V coil variants to match different control circuits. 4pin SIP form factor: standard through hole footprint for easy mounting on boards and modules. Reed relay functionality: acts as a switch controlled by the coil, enabling isolation between control and switched circuits. Compact and straightforward to use: simple replacement for failed relays in small electronics projects and equipment. Attributes at a glance Type: Reed relay switch module (replacement parts) Variants: SIP1A05 (5V coil) and SIP1A12 (12V coil) Pin configuration: 4pin Package form: SIP style 4pin relay Quantity: 50 pieces per lot Application scope: suitable for replacement and prototyping in low to moderate current signal switching Compatibility and use considerations Suitable for electronics projects and equipment that use SIP4 pin reed relays with 5V or 12V coil control. Ideal as a replacement part for damaged relays in control boards, automation modules, and hobbyist projects. Use in low to moderate load switching applications where galvanic isolation between control and load circuits is beneficial. What you can use it for Microcontroller projects: worn relays in Arduino, Raspberry Pi, or similar 5V logicbased systems to switch small loads or signals. Home and small office automation: integrate into control modules that require isolated switching for sensors, alarms, or actuated devices. Equipment and maintenance: stock for servicing devices that rely on 5V or 12V coil reed relays, enabling quick replacement without wait times. Notes This description reflects the product's model range and form factor as SIP1A05 and SIP1A12 4pin reed relay switches in a 50piece lot. Use with appropriate drive circuitry and in accordance with your system's electrical requirements.