Pravah Electricals & Electronics LLP

The Allen-Bradley 817-M is a Thermistor Monitoring Relay used to monitor temperature-sensitive systems, particularly in applications where motors and electrical equipment require protection from thermal overload. It provides protection by constantly monitoring the temperature of thermistor sensors and ensuring that equipment is safeguarded from overheating, which could otherwise lead to damage or failure.

Product Overview:

• Model: Allen-Bradley 817-M

• Type: Thermistor Monitoring Relay

• Application: Over-temperature protection for electrical motors and equipment

• Series: Allen-Bradley 817 Series

• Function: Monitors thermistor sensors for over-temperature conditions in equipment.

 XPSUAF13AP — Key Points

• Type: Safety relay / module (Preventa XPS Universal series) 

• Supply voltage: 24 V (AC or DC) 

• Safety inputs: 2 channels 

• Safety outputs: 3 normally open (NO) relay contacts 

• Diagnostic output: 1 solid‑state (non‑safety) diagnostic output for status information 

• Safety performance: Achieves high safety Integrity –
  • Category 4 / PLe according to ISO 13849‑1 
  • SIL 3 according to IEC 61508 

• Connectivity / mounting: Removable screw terminals, DIN‑rail mountable 

• Dimensions / size: ~22.5 mm width × 100 mm height × 120 mm depth 

The SICK RLY3‑EMSS100 (also referred to as SICK RLY3‑EMSS1) is a safety relay module designed for DIN-rail mounting, operating at 24 V DC with two safety inputs, and providing two normally-open (NO) safety outputs. It meets Safety Category 4, typically suitable for emergency stop and safety-critical applicationsThe module width is relatively compact (approx. 18 mm), making it suitable for panel installations with limited space It supports spring-

Manufacturer

SICK (ReLy series)

Part Number

RLY3‑EMSS100 / 1085345

Supply Voltage

24 V DC

Safety Configuration

Dual-channel safety input; 2 NO outputs

Safety Category

ISO 13849‑1 Category 4, Performance Level e, SIL 3

Mounting / Connections

DIN‑rail mounting, spring‑loaded terminals

Protection Rating

IP20

Operating Range

–25 °C to +55 °C

loaded terminal connections, has IP20 protection, and operates reliably in temperatures from –25 °C to +55 °C

he part number "440R-N23126" refers to a safety relay from Allen-Bradley, a brand of Rockwell Automation. Specifically, this is a model of the Allen-Bradley 440R series, which is known for its reliability in safety-related applications.

Safety relays are used in machinery and automation systems to ensure safe operation by monitoring safety circuits and stopping machinery when needed to prevent accidents. The Allen-Bradley 440R series includes various models with features like safety monitoring, emergency stop functions, and fault detection.

The PILZ PNOZ m EF (model number 772142) is a DIN rail-mounted safety relay module designed to expand the capabilities of the PNOZmulti 2 configurable control system. This module offers 8 safe digital inputs and 4 safe semiconductor outputs, operating at a 24 V DC supply voltage. It is suitable for applications requiring high safety integrity, such as emergency stop circuits, safety gates, and light curtains.

The Pilz PNOZ m B0 (772100) is a configurable safety controller from the PNOZmulti 2 series, designed to provide flexible and scalable safety solutions for industrial automation systems.

🔧 Key Features

• 20 Safe Digital Inputs: Supports up to 8 inputs configurable as auxiliary outputs.

• 4 Safe Semiconductor Outputs: Suitable for applications up to Performance Level e (PL e) according to ISO 13849-1 and SIL CL 3 according to IEC 62061.

• Expandable Design: Allows connection of up to 6 expansion modules and 1 communication module.

• Communication Interfaces: Supports various fieldbus protocols including CANopen, EtherCAT, Ethernet/IP, Powerlink, Profibus, and Profinet.

• User Interface: Features an illuminated display and a rotary knob for easy configuration and diagnostics.

• Programming Interface: Equipped with a mini-USB port and supports chip card storage (32kB).

• DIN Rail Mounting: Designed for easy installation in control panels.

📐 Technical Specifications

• Supply Voltage: 24 V DC

• Dimensions: 101.4 mm (H) x 45 mm (W) x 120 mm (D)

• Weight: Approximately 235 g

• Terminal Type: Screw terminals

• Protection Class: IP20

• Operating Temperature: 0°C to +55°

3SK1121-1AB40 is a Siemens SIRIUS safety relay — a control component used mainly in industrial automation and machine safety circuits.

📌 Key Characteristics

• Type: Safety relay (basic unit from the SIRIUS 3SK1 Advanced series)

• Function: Relay enabling circuit — used to monitor safety functions like emergency stops, protective doors, light barriers, magnetic switches, and other safety sensors.

• Supply Voltage: 24 V DC

• Outputs: 3 normally open (NO) safety contacts + 1 normally closed (NC) auxiliary contact

• Mounting: DIN-rail (standard industrial mounting)

• Connection: Screw terminals

• Safety Standards: High safety level (e.g., Performance Level e and SIL 3 compliant) for safe machine operation.

• Protection Rating: IP20 (basic enclosure protection)

📋 Typical Use Cases

Safety relays like this are installed in control panels and machines to:

• Detect emergency stop button activation

• Monitor safety doors or guards

• Evaluate safety sensors (light curtains, magnetic switches)

• Provide fail-safe logic for machinery shutdown

• Integrate into safety control circuits per IEC/ISO safety standards