OMRON S87A-12N Power Failure Detector 1828

( Brand: Omron ), ( Manufacturer Part Number: S87A-12N ), ( Part Type: Detector ), ( Country Of Origin: Japan )

Review OMRON Power Failure Detector

The **Omron S87A-12N Power Failure Detector (Model 1828)** is a highly reliable and versatile industrial-grade device designed to safeguard critical operations by monitoring electrical power supply integrity and ensuring seamless transitions during unexpected outages. Engineered with Omron s signature precision and durability, this power failure detector operates as an essential component in automation systems, industrial machinery, and sensitive electronic applications where uninterrupted power is non-negotiable. Its robust construction, featuring a compact yet sturdy housing, allows for easy integration into control panels, PLC systems, or standalone setups, making it an ideal solution for environments where space optimization and performance are paramount.

At the core of the S87A-12N s functionality is its advanced power monitoring capability, which continuously evaluates the stability of the incoming AC voltage. When a power failure or significant voltage drop is detected, the device triggers a rapid and configurable response, such as activating backup power sources, initiating emergency shutdowns, or signaling operators through adjustable relay outputs. The model s **12N** designation indicates its compatibility with a **normally open (NO) relay output**, which can be tailored to specific control requirements, including delayed or immediate activation based on user-defined thresholds. This flexibility ensures that the detector can be fine-tuned to meet the exact needs of diverse applications, from manufacturing lines to data centers.

One of the standout features of the S87A-12N is its **adjustable sensitivity and hysteresis settings**, allowing operators to customize the detection parameters to avoid false triggers from transient fluctuations while still reliably capturing genuine power interruptions. The device also incorporates a **visual status indicator**, providing immediate feedback on its operational state, which is invaluable for troubleshooting and maintenance. Built to withstand harsh industrial conditions, the S87A-12N is rated for operation within a broad temperature range and offers protection against dust, moisture, and electrical noise, ensuring long-term reliability even in demanding environments.

Beyond its core functionality, the Omron S87A-12N integrates seamlessly with other Omron automation products, such as PLCs and human-machine interfaces (HMIs), through its standardized electrical connections and clear documentation. This compatibility simplifies system integration and enhances overall operational efficiency. Whether deployed in a small-scale automation setup or as part of a large-scale industrial control system, this power failure detector serves as a silent guardian, mitigating risks associated with electrical instability and ensuring continuous, uninterrupted performance. With its blend of technical sophistication, adaptability, and rugged design, the Omron S87A-12N stands as a dependable choice for professionals seeking to protect their critical processes from the unpredictability of power failures.

The **Omron S87A-12N Power Failure Detector (Model 1828)** is a device designed to monitor power supply stability and provide alerts during voltage fluctuations, brownouts, or blackouts. Below is a detailed breakdown of its pros and cons, followed by a conclusion and recommendation.

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### **Pros**

1. **Reliable Power Monitoring**

The S87A-12N is designed to detect sudden power failures, voltage drops, and other electrical anomalies. It can help prevent data loss, equipment damage, or unexpected shutdowns in critical systems (e.g., servers, medical devices, or industrial machinery).

2. **Multiple Output Options**

It provides **two relay outputs (SPDT)** and **two dry-contact outputs**, allowing for flexible integration with backup power systems (UPS, generators), alarms, or other control devices. This makes it versatile for different setups.

3. **Adjustable Sensitivity**

The device allows configuration of **voltage thresholds** (e.g., low-voltage detection) and **response times**, enabling customization based on specific power conditions in your environment.

4. **Compact and Durable Design**

The unit is compact, making it suitable for installation in tight spaces. Omron products are generally known for their **rugged construction**, ensuring longevity in industrial or commercial settings.

5. **Easy Installation and Configuration**

It features **LED indicators** for status monitoring and can be programmed via **knobs or a simple interface**, reducing the need for complex setup procedures.

6. **Wide Input Voltage Range**

The device supports a **wide input voltage range (typically 85 264V AC)**, making it compatible with various global power systems without requiring additional transformers.

7. **Low Maintenance**

As a passive monitoring device, it has **no moving parts** (except relays), reducing the risk of mechanical failure over time.

8. **Cost-Effective for Basic Needs**

Compared to advanced UPS systems or dedicated power monitoring solutions, the S87A-12N offers a **budget-friendly** way to add basic power failure protection.

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### **Cons**

1. **Limited to Basic Power Monitoring**

Unlike a **full UPS (Uninterruptible Power Supply)**, the S87A-12N **does not provide backup power** it only detects failures and triggers relays. If you need runtime during outages, you ll still need a separate UPS or generator.

2. **No Built-In Logging or Networking**

The device lacks **data logging, remote monitoring, or connectivity** (e.g., no Ethernet, Wi-Fi, or Bluetooth). If you require historical power event records or remote alerts, additional hardware (e.g., a separate logger or PLC) is needed.

3. **Manual or Basic Alerts Only**

Alerts are limited to **relay contacts and LEDs**. For advanced notifications (e.g., SMS, email, or app alerts), you d need to pair it with an external system (e.g., a relay-controlled phone modem or IoT gateway).

4. **Potential Relay Wear Over Time**

While relays are durable, **frequent power fluctuations** could lead to **relay fatigue** over years of use, potentially requiring replacement.

5. **No Built-In Surge Protection**

The S87A-12N **does not protect against surges or spikes** it only monitors power integrity. If your system is prone to electrical noise, additional **surge protectors** are necessary.

6. **Limited Customization for Advanced Users**

The configuration is **not programmable via software** (unlike some Omron PLCs). Changes must be made physically, which may be inconvenient for users needing frequent adjustments.

7. **No Built-In Testing Features**

Unlike some smart power monitors, there s **no self-test or diagnostic mode** to verify relay functionality without external tools.

8. **Compatibility May Require Additional Components**

Depending on your setup, you may need **external power supplies, wiring, or mounting hardware**, adding to installation complexity.

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### **Conclusion**

The **Omron S87A-12N Power Failure Detector** is a **practical, low-cost solution** for basic power failure monitoring in environments where **immediate relay-based responses** (e.g., activating a UPS or shutting down equipment safely) are sufficient. It excels in **industrial, commercial, or sensitive electronic setups** where sudden power loss could cause damage or data corruption.

However, if you require **backup power, advanced logging, remote alerts, or surge protection**, the S87A-12N will need to be **paired with additional hardware**, increasing both cost and complexity. For **simple, reliable detection without frills**, it is an excellent choice. For **more sophisticated power management**, a UPS with built-in monitoring or a dedicated power conditioner may be better.

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### **Recommendation**

- You need a **budget-friendly, reliable way to detect power failures** and trigger backup systems (e.g., UPS, generators).

- Your setup **does not require runtime during outages** (a UPS handles that separately).

- You prefer a **plug-and-play solution** with minimal configuration.

- You operate in an environment with **frequent but predictable power fluctuations** (e.g., industrial plants, data centers with redundant power).

- You need **real-time logging, remote monitoring, or smart alerts** (consider Omron s **Power Monitoring Relays with networking** or third-party IoT-enabled solutions).

- Your system requires **surge protection or voltage regulation** (pair it with a **surge protector or a UPS**).

- You want **software-configurable settings** (some Omron PLCs or dedicated power monitors offer this).

- You need **long-term runtime during outages** (a **standalone UPS** is essential).

- **For backup power:** Use with an **Omron UPS or a third-party UPS** (e.g., APC, CyberPower).

- **For remote alerts:** Add a **relay-controlled phone modem or IoT gateway** (e.g., Raspberry Pi SMS alert system).

- **For surge protection:** Install a **dedicated surge protector** before the detector.

In summary, the **S87A-12N is ideal for its intended purpose** simple, effective power failure detection but may require supplementation for more advanced needs.

Details:

The Omron S87A-12 Power Failure Detector is a reliable and high-quality module designed for industrial automation motion control systems. With its model number S87A-12, this module is a trusted component for maintaining the functionality of your PLC temperature control system.

part #: s87a12n prices

• $87.39-$501.24

specifications temperaturcontr:

• brand: Omron
• mpn: S87a-12n
• part type: Detector
• country of origin: Japan

general temperaturcontr:

• condition: Used
• PLCs HMIs > PLC Peripheral Modules > PLC Temperature Modules

shipping temperaturcontr:

• carrier: USPS
• class: Standard
• service: USPS Ground Advantage
• type: Fixed
• cost: $4.99
• transit: 6-12 Days

offer temperaturcontr:

• options: Ship-to-home
• sold: 0
• best offers: True
• started: February 12, 2026
• availability: In Stock
• quantity: 2

returns temperaturcontr:

• policy: No Returns

payments temperaturcontr:

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• credit card: Diners-club

seller temperaturcontr:

• rating: 99.1%
• city: Sparks, Nevada
• # reviews: 1107

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