Timing Relays in Star-Delta Motor Starters
How a star-delta timing relay sequences run-up and transition in a star-delta motor starter, and how to set, wire and select one.
8 min read
Technical
Application guides
Guides and notes on industrial electrical and automation parts: selection, wiring, settings and ordering.
- Articles
- 29
- Latest
Interface Relays in Building and Room Automation
How interface relays isolate BMS and room-controller outputs from HVAC, lighting and shading loads in building automation panels, and what changes about socket, coil and contact selection versus a standard...
11 min read
Interface Relays in PLC Control Panels
How interface relays isolate PLC I/O, wire to sourcing and sinking outputs, and switch contactor coils and solenoids inside a control panel.
9 min read
Overload Relays in Motor Control Centers (MCC) Guide
How the overload relay in an MCC bucket protects its motor, from dial setting and trip class to Type 2 coordination and SCADA wiring.
9 min read
MCBs in Industrial Control Panels
How to select MCB curves and ratings for control transformers, 24 V DC supplies, PLC I/O, and auxiliary circuits inside an industrial control panel.
12 min read
Overload Relays for Compressor Motors
How to size, class, and protect compressor motor overload relays against nuisance tripping and phase-loss burnout.
9 min read
Monitoring Relays in Water and Wastewater Treatment
How level, phase-sequence, thermistor and insulation monitoring relays protect pumps and panels across water and wastewater treatment plants.
9 min read
Overload Relays for Conveyor Motors
How to set overload relay trip class, FLC dial, and reset mode for conveyor motors, including star-delta sizing and multi-drive belt systems.
9 min read
MPCBs in Motor Control Centers (MCC)
How MPCBs function as the branch-circuit protective device inside MCC combination-starter buckets, from bucket architecture and sizing to coordination and group protection.
10 min read
MCBs in Consumer Units and Final Circuits
How MCB rated current and tripping curve are selected per final circuit type in a consumer unit, with RCD/RCBO pairing and board layout guidance for panel builders.
10 min read
MPCB for Compressor Motors
How to size the thermal dial, choose the right trip class, and combine an MPCB with a contactor for reciprocating, screw, and scroll compressor motors.
9 min read
MCCB for Capacitor Bank Protection
How to size an MCCB for capacitor bank protection, covering switching inrush, the 1.35-1.5x sizing multiplier, magnetic trip settings, harmonic derating, and contactor coordination.
9 min read
Monitoring Relays in HVAC and Building Services
Phase, current, temperature and level monitoring relays protect chillers, AHU fans, pumps, and cooling towers across HVAC and building services plant rooms.
9 min read
VFD for Compressors: Selection Guide
How to select and size a VFD for screw, reciprocating and centrifugal compressors, covering overload rating, turndown limits and energy savings.
9 min read
Overload Relays for Pump Motors: Selection and Setting
How to pick the trip class, set the dial, and choose a reset mode for pump motor overload relays across centrifugal, positive-displacement, and submersible applications.
10 min read
Soft Starter in HVAC Systems
How soft starters are applied on AHU fans, cooling tower fans, and chilled/condenser water pumps in HVAC plants, with sizing, ramp-down, and protection guidance.
9 min read
MPCB for Conveyor Motors
How to size the thermal dial, choose the right trip class for belt inertia, and protect conveyor motors with an MPCB.
10 min read
MCCB in Motor Control Centers (MCC)
How MCCBs function as MCC section incomers and starter-bucket feeders, coordinate with contactors and overloads for Type 2 protection, and interact with withdrawable construction and busbar bracing.
10 min read
Monitoring Relays for Pump Stations and Water Supply
Level, phase-sequence and current monitoring relays that protect pump stations from dry-run, wrong rotation and impeller jams.
11 min read
VFD for Conveyors: Selection and Setup
How to size and set up a VFD for conveyor loads, covering HD overload duty, breakaway torque, control method, braking and cable length.
9 min read
RCDs in Industrial Panels and Machines
How to size, type-select, and coordinate RCDs and RCBOs across industrial panels and VFD-driven machines.
9 min read
MCCB for Generator and Genset Protection
How to size and set MCCBs on generator and genset main breakers, given the alternator's lower and decaying short-circuit current compared to grid infeed.
11 min read
Soft Starter for Compressors: Selection and Setup
How to size and configure a soft starter for reciprocating, screw and centrifugal compressors, from unloader torque through duty cycle and bypass selection.
9 min read
MPCB for Pump Motors: Selection and Setting
How to size the thermal dial, select trip class, and protect against phase loss when specifying an MPCB for a pump motor.
10 min read
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