1. Product Overview
TMDJ521ZC1 is an electronic defrost timer designed for household refrigerators. It ensures efficient operation and extends the service life of the refrigerator by accurately controlling the defrost cycle. It is widely used in refrigerators of brands such as LG, Samsung, and Hisense, and is an ideal choice for economical replacement parts.

2. Core functions
Precise defrost control
Adopting an electronic timing mechanism, it automatically triggers the defrost program every 8-12 hours to prevent frost inside the refrigerator and maintain optimal refrigeration efficiency.
Supports PTT defrost mode, which can adapt to complex environments such as high humidity and low temperature, dynamically optimize defrost strategies, and reduce energy waste.
Stable and reliable mechanical structure
Made of high-quality plastic and metal materials, it is vibration-resistant and wear-resistant, suitable for frequent household use.
Built-in micro-motor drive gear and cam structure, control the defrost circuit through elastic reed contacts, compact structure and low failure rate.
Intelligent power-off protection
With power-on relay function, it can automatically resume operation according to the previous working status and current refrigerator temperature after an accidental power outage, without manual reset.
Easy installation and versatility
The design is simple, and users can quickly replace the old timer without professional skills.
Compatible with most household refrigerator brands, it is highly versatile as a replacement part.

3. Technical advantages
No wear and no noise: Compared with traditional mechanical timers, electronic control eliminates physical wear and noise problems.
Flexible time setting: The defrost cycle can be adjusted according to needs, making it more flexible to use.
Patented design: The "S"-shaped block is used to isolate the elastic spring to avoid multiple contacts from contacting at the same time and improve working stability.
Service guarantee
1-year warranty: Provide spare parts support to ensure long-term worry-free use.
High cost performance: The wholesale price is about US$1.5-3, suitable for retail or large-scale purchases.
Applicable scenarios
Household refrigerator defrost control, replacing aging or faulty timers.
Low temperature and high humidity environments that require frequent defrosting to improve refrigerator operation efficiency.